PROCESSES AND APPLICABLE SPECIFICATIONS FIFTEENTH EDITION
CALL 310-478-0078 EXT 237 OR 274 FOR THE COMPLETE BOOK!

PROCESS
ALODINE ANODIZE – CHROMIC ACID ANODIZE – SULFURIC ACID ANODIZE – HARD ANODIZE – SEAL DURASEAL
ANODIZE PRINTING BAKING BLACK OXIDE BLASTING
BRIGHT DIPS CADMIUM CHEMICAL FILMS CHROMIUM CHROME PICKLE
CHROMIC ACID TOUCH UP COPPER COPPER SULFATE TEST DOW #7 DOW #9
DOW #19 DOW #21 DRY FILM LUBE or DRY LUBE ELECTROLESS NICKEL ETCHING
GALVANIC ANODIZE HAE HUMIDITY TEST HYDROGEN EMBRITTLEMENT RELIEF IRIDITE
IRIDITE #15 MAGNETIC PARTICLE INSPECTION NICKEL PAINTING PASSIVATE
PENETRANT INSPECTION PHOSPHATE (Heavy) PHOSPHATE (Light) PICKLING +POLISHING
PREVENTIVE COM- POUND SOLVENT CUTBACK COLD APPLICATION SILK SCREEN PRINTING SILVER SOLID FILM LUBRICANT STRESS RELIEF
SULFAMATE NICKEL TESTING TIN TITANIUM CLEANING AND DESCALING ZINC

PROCESS METAL APPLICABLE
SPECIFICATION
NORMAL COATING THICKNESS
AND COLOR OR APPEARANCE
REMARKS
ALODINE See CHEMICAL FILMS

ANODIZE – CHROMIC ACID ALUMINUM MIL-A-8625/AMS-A-8625

TYPE I – Conventional TYPE IB – Low Voltage

CLASS 1 – Non Dyed

CLASS 2 – Dyed

.00002-.0003 Clear to dark gray depending on alloy Not to be applied to alloys with copper
content in excess of 5.0% or silicon in excess 7.0% and when total
alloying elements exceed 7.5%. Non-conductive, good paint base, poor
abrasion resistance, not good for dyes except black. Should be used for
close tolerance parts.

ANODIZE – SULFURIC ACID ALUMINUM MIL-A-8625/AMS-A-8625

TYPE II

CLASS 1 – Non Dyed

CLASS 2 – Dyed

.00007-.001 Clear All colors Not to be applied to assemblies or parts
with joints or recesses which might entrap solution. Good electrical
barrier and paint base. May be dyed in all colors. Dichromate seal, when
specified, will impart yellow color. Produces excellent decorative
finishes when the part is either polished, brushed, or bright dipped
prior to anodizing. Good corrosion and abrasion resistance.

ANODIZE – HARD ALUMINUM MIL-A-8625/AMS-A-8625

TYPE III

CLASS 1 – Non Dyed

CLASS 2 – Dyed

Unless otherwise specified, .0016/.0024 will be applied. Color will vary with alloy and thickness Dense hard wear resistant coating. Coatings
are approximately 50% penetration and 50% buildup. Excellent dielectric
and heat absorption properties. May be considered for minor salvage
applications. Sealing greatly increases corrosion resistance, but
slightly reduces wearing qualities. Teflon sealing may be substituted to
increase lubricity.

ANODIZE – SEAL DURASEAL ALUMINUM NONE No dimensional change The ultimate seal for corrosion resistance on all alloys, exceeds AMS-A-8625 requirements.

ANODIZE PRINTING ALUMINUM NONE .0001-.001 Clear All colors A method of anodizing letters, symbols, characters, logos, and numerals on
an anodized background. The letters are of one color and the background of
another. Superior to regular ink printing because of the corrosion and solven
resistance of anodize, and is an excellent alternative to engraving.

BAKING ALL In accordance with applicable plating specification No dimensional change Slight staining may result Used for stress relief or hydrogen
embrittlement before and/or after processing; for improving the adhesion
of plating the base metal; or increasing the hardness of plating. All
ovens are certified.
+CANCELLED

*We do not perform this process but it can be vended to an approved source for your convenience.


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page2
PROCESS METAL APPLICABLE
SPECIFICATION
NORMAL COATING THICKNESS
AND COLOR OR APPEARANCE
REMARKS
BLACK OXIDE IRON, STEEL, STAINLESS STEEL, COPPER ALLOYS +MIL-C-13924 s/s

MIL-DTL-13924/AMS 2485

CLASS 1 – Iron & Steel

*CLASS 2 – 400 series stainless steel

*CLASS 3 – Fused salt process

CLASS 4 – Stainless steel MIL-F-495 – copper alloys

No dimensional change Black Poor abrasion resistance. Poor corrosion
resistance except for some 300 series stainless steels with CLASS 4
coating. Used where a black surface and low light reflection is
required. Supplementary wax or oil dip (VV-L-800 Preservative Water
Displacing Oil on CLASS 1) will improve appearance and corrosion
resistance. Good for decorative purposes when base metal is polished
before processing. Not recommended for long term storage of parts,
unless packing protection is included.

BLASTING (includes glass bead and Aluminum oxide) ALL MIL-STD-1504 or as required by applicable process specification May remove metal Dull to semi-bright For removing scale and rust, etc., and
blending imperfections. The amount of metal removed will depend on media
selected. May be used for decorative and optical finishes. Provides
uniform matte finish before decorative processing.

BRIGHT DIPS ALUMINUM, BRASS, COPPER NONE Removes metal Bright Chemical polishing which improves appearance of finishes on aluminum,
brass and copper. Used for cleaning metal before welding and pressure
testing.

CADMIUM ALL +QQ-P-416 s/s AMS-QQ-P-416 TYPE
I-Without supplementary chromate treatment TYPE II-With
supplementary chromate treatment TYPE III – With supplementary
phosphate treatment
CLASS 1 – .0005 Min.

CLASS 2 – .0003 Min.

CLASS 3 – .0002 Min.

TYPE I – Clear

TYPE II – Gold, Olive Drab, Black Treatment

TYPE III – Gray Dull to bright

Most commonly used plating. High density of
plate affords excellent corrosion resistance. TYPE I coating is very
susceptible to stains and fingerprints. TYPE II coating is excellent for
resistance to moisture and humidity, and a paint base. Chromate colors
besides gold are clear, olive drab and a black treatment. TYPE III is a
good paint base. Stress relief is required on metal with a hardness of
Rockwell C34 or above and hydrogen embrittlement relief is required
after plating on metal with a hardness of Rockwell C36 or above.

CHEMICAL FILMS (Alodine, Iridite, etc.) ALUMINUM +MIL-C-5541 s/s AMS – C- 5541

CLASS 1A for maximum protec- tion against corrosion on painted or unpainted surfaces.

CLASS 3 for protection against corrosion where low electrical resistance is required.

No dimensional change Gold or clear as specified Used mainly as a paint base that improves
paint adhesion. Good corrosion resistance. Electrically conductive.
Normally gold color unless otherwise specified. CLASS 3 coating is used
primarily for low electrical resistance contact and has less corrosion
resistance than CLASS 1A coating.
CHROMIUM ALL +QQ-C-320 s/s AMS-QQ-C-320

CLASS 1 – Corrosion protective (decorative)

TYPE I – Bright

TYPE II – Satin

*CLASS 2 – Engineering (hard)

CLASS 1 – .00001-.00005 (plus underplate)

*CLASS 2 – .002 unless otherwise specified

Dull to bright

Decorative chrome is normally applied over
copper and nickel plate. TYPE I bright coating is put on either the base
metal that is polished or as is. TYPE II satin coating is put on the
base metal that is either blasted, grained or brushed. Hard chrome is
plated directly on the base metal. Parts requiring heavy metal deposits
should be overplated and ground to the final finished dimension.
+CANCELLED

*We do not perform this process but it can be vended to an approved source for your convenience.


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page3
PROCESS METAL APPLICABLE
SPECIFICATION
NORMAL COATING THICKNESS
AND COLOR OR APPEARANCE
REMARKS
CHROME PICKLE MAGNESIUM Gray to brown Affords some protection and may be required before machining.

CHROMIC ACID TOUCH UP

See Dow #19
COPPER ALL +MIL-C-14550(s/sAMS-2418) CLASS 0 –
.001-.005 CLASS 1 – .001 min. CLASS 2 – .0005 min. CLASS 3 –
.0002 min. CLASS 4 – .0001 min. AMS-2418 TYPE 1 – Engrg. Plating
Thickness = .0005-.0007 TYPE 2 – Plating for masking Thickness =
.002 nominal

Stop off for heat treat (CLASS 0) and
carburizing (CLASS 1). Undercoat for other plated metals to improve
adhesion, corrosion resistance, and to increase electrical conductivity
(CLASS 2). Under tin plating to prevent base metal migration into the
tin (prevents poisoning solderability) (CLASS 3 and CLASS 4).
COPPER SULFATE TEST See TESTING

DOW #7 (Dichromate Treatment) MAGNESIUM AMS-M-3171 TYPE III

ASTM D1732 CLASS 1, TYPE III

No dimensional change Brassy to dark brown Good paint base. Best corrosion
protection of the chemical coatings on magnesium. May be applied to all
alloys except EK30A, EK41A, EK33A, HK31A, M1A, HM31A, HM21A, and LA141A.

DOW #9 (Galvanic Anodize) MAGNESIUM AMS-M-3171 TYPE IV

ASTM D 1732 CLASS 2, TYPE I

No dimensional change Dark brown to black Good paint base. Used on alloys that won’t take DOW#7 and parts requiring a non-reflective black coating.

DOW #19 (Chromic Acid Touch Up) MAGNESIUM AMS-M-3171 TYPE VI No dimensional change Brassy to brown Commonly used to touch up rack marks, surface scratches, reworked areas, and surfaces that have been remachined or abraded.

DOW #21 (Ferric Nitrate Bright Pickle) MAGNESIUM NONE Removes metal Satin to bright Good paint base. Poor corrosion resistance. May be coated with lacquer or clear bake enamel to preserve brightness.

DRY FILM LUBE or DRY LUBE See SOLID FILM LUBRICANT
+CANCELLED

*We do not perform this process but it can be vended to an approved source for your convenience.


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page4
PROCESS METAL APPLICABLE
SPECIFICATION
NORMAL COATING THICKNESS
AND COLOR OR APPEARANCE
REMARKS
ELECTROLESS NICKEL ALL AMS-C-26074

CLASS 1 – As plated, no subse- quent heat treatment

CLASS 2 – Heat treated to obtain required hardness

CLASS 3 – On aluminum alloys, nonheat-treatable, & beryllium alloys, processed to verify nickel adhesion

CLASS 4 – On aluminum alloys, heat-treatable, processed to verify nickel adhesion AMS 2404 = Thks. as specified

Semi-bright

GRADE A = .0010 min.

GRADE B = .0005 min.

GRADE C = .0015 min.

100% uniformity of plating thickness on
all accessible internal and external areas. Exceptionally good for
salvage purposes. Good corrosion, oxidation, and wear resistance.
Facilitates soldering on aluminum and brazing on stainless steel. CLASS 1
and CLASS 2 coated steel parts, Rockwell C40 or above, are baked for
hydrogen embrittlement relief. CLASS 2 coated parts are additionally
heated to 500 degrees F. or more, to harden the nickel deposit to 800
Knoop or better. CLASS 3 and 4 coated parts shall be baked for 1-1 1/2
hours at 375 degrees or 250 degrees F. respectively.

ETCHING MOST NONE Removes metal. Dull to bright To improve appearance, remove burrs and oxidation, clean for spot welding, give satin finish, prepenetrant etch, etc.

GALVANIC ANODIZE

MAGNESIUM See Dow #9
HAE (A superior type of
anodic coating)
MAGNESIUM +MIL-M-45202s/sASTM D 1732

TYPE 1 – Light coating

CLASS A – Tan coating

GRADE 1 – No post treatment

GRADE 2 – With bifluoride- dichromate post treatment

TYPE II – Heavy coating

CLASS A – Hard brown coating

GRADE 1 – No post treatment

GRADE 3 – With bifluoride- dichromate post treatment

GRADE 4 – With bifluoride- dichromate post treatment including moist heat aging

GRADE 5 – Same as grade 4 except double bifluoride
dichromate post treatment ASTM D 1732 CLASS 2,TYPE III

TYPE I CLASS A .0001-.0003 Tan TYPE II CLASS A .0013-.0017
Oatmeal to dark brown ASTM D 1732 Class 2, Type III 1st
Phase = Thks .0002″ 2nd Phase = Thks .001-.0012″
It is generally agreed by most authorities that this treatment
is the best all around coating for magnesium in existence. The coating
thickness is approximately 40 percent penetration and 60 percent
buildup. When selected organic post-treatments are applied, a salt spray
test of up to 1000 hours is possible. The coating is non-conductive.
TYPE II coatings have extremely good resistance to abrasion. TYPE I
light coatings are normally tan in color. TYPE II heavy coatings will
range from an oatmeal color to dark brown, depending on the thickness of
the coating. HAE coatings are not affected by extreme temperature
variations. A heavy coated panel heated to 1075 degrees F. and plunged
into ice water will show no ill effects to the coating. This process can
be selectively applied by masking the areas that have to be free of
coating for: electrical grounding, close tolerance dimensions, heavy
buildups for salvage purposes, etc. The coating may be used on all
magnesium alloys.

HUMIDITY TEST See TESTING
+CANCELLED

*We do not perform this process but it can be vended to an approved source for your convenience.


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page5
PROCESS METAL APPLICABLE
SPECIFICATION
NORMAL COATING THICKNESS
AND COLOR OR APPEARANCE
REMARKS
HYDROGEN EMBRITTLEMENT RELIEF

See BAKING
IRIDITE See CHEMICAL FILMS

IRIDITE #15 MAGNESIUM AMS-M-3171 TYPE VIII Experience shows it may remove metal Brassy to dark brown Good paint base on all alloys. Limited corrosion protection.
Used for alloys that won’t take Dow #7. Careful control is necessary to
avoid etching of base metal.

MAGNETIC PARTICLE INSPECTION STEEL AND MAGNETIC MATERIAL ASTM E 1444 No dimensional change No appearance change This inspection method is used for detecting cracks, seams,
laps, inclusions, welding flaws, and discontinuities on the surfaces of
ferromagnetic materials.

NICKEL (Electrodeposited) ALL +QQ-N-290s/sAMS-QQ-N-290

CLASS 1 – Corrosion protective

CLASS 2 – Engineering
(Also see SULFAMATE NICKEL)

CLASS 1

GRADE A – .0016 min.

GRADE B – .0012 min.

GRADE C – .0010 min.

GRADE D – .0008 min.

GRADE E – .0006 min.

GRADE F – .0004 min.

GRADE G – .0002 min.

CLASS 2 – as specified

There is a nickel finish for almost any need. Nickel can be
deposited in soft or hard form, dull to bright finish. Corrosion
resistance is related to the thickness applied. Low thermal expansion.
Slightly magnetic. CLASS 2 plating will be .002 to .003 thick unless
otherwise specified, but may be controlled to fit any engineering
application. CLASS 1 coatings that include copper undercoat are used for
decorative chromium systems. Embrittlement relief is required on all
metals with hardnesses above Rockwell C40.

PAINTING (Spray) ALL MIL-T-704 MIL-F-7179 MIL-F-18264 Thickness as specified Colors per FED-STD-595 or custom matched Our facilities can apply materials such as alkyd, acrylic,
epoxy, and polyurethane enamels, vinyl and acrylic lacquers, varnishes
and resin coatings, epoxy, acid-wash, red-oxide, and zinc chromate
primers. Finishes such as class A, hammertone, wrinkle, and texture.
Also, see SOLID FILM LUBRICANT.

PASSIVATE STAINLESS STEELS AMS2700 Method I only/+AMS-QQ-P-35

TYPE II – Medium temp. nitric acid solution with sodium dichromate additive

TYPE VI – Low temp. nitric acid solution

TYPE VII – Medium temp. Nitric acid solution

TYPE VIII – Medium temp. high concentration nitric acid ASTM A 967

No dimensional change No appearance change Dissolves all traces of foreign materials such as pieces of
iron particles, tool scrapings, chips, etc. that will cause rust or
stain spots if they are not removed. A thin transparent passive film
forms over the surface and prevents this condition from occurring. The
presence of rust and/or heavy heat treat scale may necessitate a
prepickle. Our inspection personnel conduct the required copper sulfate,
salt spray, and water immersion inspection tests in our own testing
department and chemical laboratory in accordance with AMS-STD-753 and
ASTM B 117. (See TESTING)
+CANCELLED

*We do not perform this process but it can be vended to an approved source for your convenience.


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page6
PROCESS METAL APPLICABLE
SPECIFICATION
NORMAL COATING THICKNESS
AND COLOR OR APPEARANCE
REMARKS
PENETRANT INSPECTION ALL ASTM E 1417 TYPE I – Fluorescent dye

TYPE II – Visible dye METHOD A – Water-washable METHOD B –
Post emulsifiable (lipophilic) METHOD C – Solvent removable
METHOD D – Post emulsifiable (hydrophilic)

Prepenetrant etch of .0002 – .0004 metal removal on all alloys when approved by consumer This process is generally used on aluminum, magnesium, and
stainless steels. It can, however, be useful on other metals and
materials. Detects cracks, discontinuities, corrosion, welding flaws,
laps, cold shuts and porosity. Prepenetrant etching is performed in
house when required and approved. Critical surface finishes and areas
with close tolerances are masked, as required, to protect them from
metal removal, prior to the etching operation.

PHOSPHATE (Heavy) IRON AND STEEL +DOD-P-16232 s/s
MIL-DTL-16232
TYPE M – Manganese base
TYPE Z – Zinc base

CLASS 1 – With preservative
treatment when specified

CLASS 2 – MIL-PRF-16173Gr.3
preservative treatment

CLASS 3 – No preservative
treatment

*CLASS 4 – Chemically
converted

.0002-.0006 avg. thickness, however coating is measured by weight
Gray to Black

Type M-16g/m2

Type Z-11g/m2

Abrasive blasting is the required pretreatment, unless
otherwise specified by customer or drawing. Used for corrosion
protection of ferrous metals. Also used to prevent galling in cold
extrusion and deep-drawing applications. Not recommended if the coating
is expected to come in contact with alkaline materials or to be exposed
to temperatures above 200 degrees F.

CLASS 2 and CLASS 4 coatings extend the corrosion protection of
the phosphate. MIL-PRF-3150 oil may be used as an alternative for very
small parts under Type M CLASS 2. Provides an improved break-in coating.

PHOSPHATE (Light) IRON AND STEEL TT-C-490 Zinc base TYPE 1 TYPE V Minor dimensional change

TYPE 1 300-500 mg/sq ft coating weight

TYPE V 500-1100 mg/sq ft coating weight Gray

Used for pretreatment of base metal for organic coatings such
as primer, enamel, lacquer, etc. Improves corrosion resistance of the
base metal, and promotes better adhesion between the base metal and the
organic coating. Also, used for post treatment of both cadmium and zinc
plating.

PICKLING ALL In accordance with applicable plating specifications Removes metal
Cleaner and brighter surface
Generally used as a cleaner to remove corrosion, rust and scale
from heat treating or welding. The hazards involved in this process
should be investigated before using.

*POLISHING ALL NONE Removes metal Satin to bright Bright buffing and satin brushing, or graining for plated or unplated decorative finishes. Removes surface imperfections.
+CANCELLED

*We do not perform this process but it can be vended to an approved source for your convenience.


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page7
PROCESS METAL APPLICABLE
SPECIFICATION
NORMAL COATING THICKNESS
AND COLOR OR APPEARANCE
REMARKS
PREVENTIVE COM- POUND SOLVENT CUTBACK COLD APPLICATION ALL MIL-PRF-16173 GRADE 1 – Hard film GRADE 2 – Soft film GRADE
3 – Water displacing, soft film GRADE 4 – Transparent, non- tacky
film

GRADE 5 – Hot water-low pressure removable film

GRADE 1 – .004 max. (0 to 175 degrees F. resistant)

GRADE 2 – .002 maximum (-40 degrees F. resistant)

GRADE 3 – .001 maximum

GRADE 4 – .002 max. (-40 to 175 degrees F. resistant)

GRADE 5 – .001 maximum Brown to Black

Corrosion preventives are applied in a petroleum solvent. The
solvent evaporates leaving a protective film. GRADE 1 is for metals
exposed to outdoor weather, for up to one year. GRADE 2 is for machine
parts, indoors for up to six months. GRADE 3 is for displacing water and
protection of interior parts for up to four months. GRADE 4 is for
indoor or shed storage of parts. Also, where a tack-free or translucent
coating is required. GRADE 5 is the same as GRADE 3 except the film is
removed with hot water or low pressure steam.

SILK SCREEN PRINTING ALL AS SPECIFIED (Also see ANODIZE PRINTING) No dimensional change All colors An excellent means to label parts for identification and
information with enamel, epoxy, lacquer, plastisol or vinyl inks. Print
on metal anodized, bare, painted, plated, etc.

SILVER ALL AMS 2410, AMS 2411 & AMS 2412 QQ-S-365s/s ASTM B 700

TYPE I – Matte

TYPE II – Semi bright

*TYPE III – Bright GRADE A – With supplemen- tary tarnish-resistant treatment

GRADE B – Without supplementary tarnish-resistant treatment

ASTM B 700

TYPE I – III – Purity GRADE A – Matte GRADE D – Semi bright

*GRADE B + C – Bright

CLASS N – no tarnish resistant

CLASS S – with tarnish resistant.

.0005 unless otherwise specified. Suggested are .0003 for
soldering parts: .0005 for corrosion protection of nonferrous basis
metals. See REMARKS
Excellent conductivity. Application of light water dip lacquer
or tarnish-resistant treatment per GRADE A does not impair
solderability. Greatly increases conductivity of lesser metals. Ferrous
basis surfaces require an undercoat of .0005 comprised of copper or
nickel or any combination. Nickel undercoat is advantageous when
corrosion protection is important.
SOLID FILM LUBRICANT ALL AS-5272 TYPE I, TYPE II

MIL-PRF-46010 TYPE III

MIL-L-23398

MIL-L-45983

MIL-L-81329

MIL-L-85614

.0003-.0005 Dull gray to black Pretreatment compatible with the base material is normally
necessary (ie; anodize, chemical film, blasting and phosphate etc.) Low
co-efficient of friction reduces wear, prevents galling and seizing.
Excellent fluid and corrosion resistance when used in conjunction with
pretreatment.

STRESS RELIEF

See BAKING
SULFAMATE NICKEL ALL +QQ-N-290s/sAMS-QQ-290

CLASS 2

.002-.003 or as specified Semi-bright Low stressed nickel deposit. Used for wear and abrasion
resistance. Also, for heavy buildups on worn parts and for salvage
purposes.
+CANCELLED

*We do not perform this process but it can be vended to an approved source for your convenience.

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page8
PROCESS METAL APPLICABLE
SPECIFICATION
NORMAL COATING THICKNESS
AND COLOR OR APPEARANCE
REMARKS
TESTING (for lot acceptance) ALL PLATED AND UNPLATED ASTM B 117 – Salt Spray MIL-STD-753
*METHOD 100 – Humidity METHOD 101 – Water immersion METHOD 102 –
Copper sulfate Also applicable process specifications
No dimensional change Salt spray is considered a “destructive” test. These tests are designed to verify the
integrity of various metals and metal surface finishes. The salt spray
method is used extensively for testing of anodize, chemical films, and
plated metal coatings. The salt spray, humidity, water immersion, and
copper sulfate methods are used to check on the passivity of stainless
steel after the passivation process.

TIN ALL ASTM B 545

CLASS A – Mild service with no exposure to atmosphere

CLASS B – Mild service for sol- dering or antigalling CLASS C – Moderate service with indoor exposure

CLASS D – Severe service with exposure to dampness and/or mild corrosion conditions

CLASS E – Very severe service

CLASS A- .0001 min.

CLASS B- .0002 min.

CLASS C- .00032 min. .0004 for steel substrates

CLASS D- .0006 min. .0008 for steel substrates

CLASS E- .0012 min. Dull gray to bright appearance

Dull ( matte) or bright appearance must be
specified. Underplate of copper (.0001 min.) or nickel (.000050 min.)
must be used on brass and zinc alloys to prevent zinc migration. For
CLASS A plating that will not be exposed to solder temperatures
(especially those that must function as electrically conductive
surfaces), a nickel underplate of .000050 min., shall be applied prior
to tin plating. Dull and bright tin have excellent solderability and
fair corrosion resistance. At room temperature dull (matte) plating
oxidizes slowly but bright plating oxidizes less readily. Dull and
bright tin have low electrical resistance and antigalling properties.

TITANIUM CLEANING AND DESCALING TITANIUM ASTM B 600 Cleaning – no metal removal Descaling – metal removal Uniform metallic appearance Cleaning process – the removal of
discolorations and stains. Descaling process – the removal of oxides,
heat treat scale, surface contaminants by acid pickling or abrasive
blasting.

ZINC ALL ASTM B 633 TYPE I – Without supplementary
treatment TYPE II – With colored chromate conversion coatings TYPE
III – With colorless chro- mate conversion coatings TYPE IV – With
phosphate conversion coatings
F2/Zn 25 (25 microns)-.001 SC 4 (very
severe) Fe/Zn 13 (13 microns)-.0005 SC 3 (severe) Fe/Zn 8 (8
microns)-.0003 SC 2 (moderate) Fe/Zn 5 (5 microns)-.0002 SC1 (mild)

TYPE I – Clear

TYPE II – Gold

TYPE III – Clear TYPE IV – Gray Dull to bright

Gives galvanic protection to base metal.
Untreated (TYPE I) zinc plating does not maintain its bright surface for
a very long period of time. TYPE II AND TYPE III treatments retard the
formation of white corrosion products on the plated surface. The service
life of zinc plating is a function of conditions such as thickness,
exposure, and usage. The Service Conditions are as follows SC 4 – Very
Severe. Exposure to harsh conditions, or subject to frequent exposure to
moisture, cleaners, and saline solutions, and damage by denting,
scratching, or abrasive wear. SC 3 – Severe: Exposure to condensation,
perspiration, infrequent wetting by rain, and cleaners. SC 2 – Moderate:
Exposure mostly to dry indoor atmospheres but subject to occasional
condensation, wear, or abrasion. SC 1 – Mild: Exposure to indoor
atmospheres with rare condensation and subject to minimum wear or
abrasion.
+CANCELLED

*We do not perform this process but it can be vended to an approved source for your convenience.


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