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(Magnetic Particle Inspect & Fluorescent Penetrant Inspect)
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Anodize (Chromic & Sulfuric)
Conventional Types I, IB and II anodic coatings are intended to improve surface corrosion protection under
severe conditions or as a base for paint systems. Coatings can be colored with a large variety of dyes and pigments.
Types I and IB coatings should be used on fatigue critical components (due to thickness of coating).
Type IC and IIB coatings provide non-chromatic alternatives to type I and IB where corrosion resistance, paint
adhesion and fatigue resistance is required.
Type I unless otherwise specified shall not be applied to aluminum alloys with over 5% copper, 7% silicon or total alloying constituents over 7.5%.
Prior to dyeing or sealing coatings shall meet weight requirements in Table 1 of Spec.
Specify class of anodic coating and any special sealing requirements.
Type I
.00002"-.00007" Chromic acid conventional anodizing.
Type IB
.00002"-.00007" Mineral or mixed mineral/organic acid anodize. Provides a non-chromic alternative for type I
and IB coatings.
Type IC
.00002"-.0007"
Mineral or mixed mineral/organic acid anodize. Provides a non-chromic alternative for
type I and IB coatings.
Type II
.00007"-.0010"
Conventional sulfuric anodizing.
Type IIB
.00002"-.0007"
Thin sulfuric anodizing for use as non-chromic alternatives for Type I and IB coatings.
Class 1
Non-dyed.
Class 2
Dyed. Specific color on contract.
Hard Anodize
Color will vary from light tan to black depending on alloy and thickness. Can be dyed in darker colors depending on thickness.
Coating PENETRATES base metal as much as builds up on the surface. The term thickness
includes BOTH the buildup and penetration. Provides very hard ceramic type coating.
Abrasion resistance will vary with alloy and thickness. Good dielectric properties.Do not seal coatings where main function is to obtain maximum abrasion or wear resistance. When used for exterior applications requiring corrosion resistance but permitting reduced abrasion resistance, the coating shall be sealed (boiling deionized water or hot 5% sodium dichromate solution, shall not exceed 1.5mg/1000 cycles.
Type III
As Specified on drawing. If not specified nominal; thickness shall be .002".
Class I
Not Dyed or pigmented.
Class II
Dyed. Specific color on contract.
Process can be controlled to be very close thickness tolerances.
Where Maximum serviceability or special properties are required, consult metal finisher for best alloy choice.
Thick coatings (over .004") will tend to break down sharp edges. Typical applications:
hydraulic cylinders wear surfaces, actuating cams, etc. Can be used for electrical
insulation coating. "Flash" hard anodize may be used instead of conventional anodize for
corrosion resistance and may be more economical in conjunction with other hard anodize areas.
Silver Plate
White matte to very bright in appearance. Good corrosion resistance, depending on base metal.
Will tarnish easily. Hardness varies from about 90 Brinnell to about 135 Brinnell depending
on process and plating conditions. Solderability is excellent, but decreases with age. Best electrical
conductor.Passivate
Intended to improve the corrosion resistance of parts made from austenitic, ferritic and martensitic corrosion-resistant steels of the 200, 300, and 400 series and precipitation hardened corrosion-resistant steels. 440C grades may be exempt from passivation treatments at the discretion of the procuring activity. TYPE II Medium temperature nitric acid solution with sodium dichromate additive. TYPE VI Low temperature nitric acid solution.
Chemical Films
Materials qualified produce coatings that range in color from clear to iridescent yellow or brown. Inspection difficulties may arise with clear coatings because visual inspections does not reveal the presence of coating.
Class 1A
Class 1A chemical conversion coatings are intended to provide corrosion prevention with left unpainted as well as to improve adhesion of paint finish systems of aluminum and aluminum alloys. May be used on tanks, tubing's and component structures where paint finishes are not required for the exterior surfaces but are required for the interior surfaces.
Class 3
Class 3 chemical conversion coatings are intended for use as corrosion preventative film for electrical and electronic applications where lower resistant contacts, relative Class 1A coatings and anodic coatings in accordance with MIL-A-8625, are required. The primary difference between a Class 1A and Class 3 coating is thickness.
Chrome Plate
Excellent hardness (Rc68-74), wear resistance and erosion resistance. Has low coefficient of
friction, and is resistant to heat. In addition to the above properties, can be rendered porous for lubrication purposes.All coated steel parts having a hardness of Rockwell C36 and higher shall be baked at a minimum 375 +/-25 F per the following schedule:
| Tensile Strength (Ksi) | Time (At Temperature Hours) |
| 160-180 | 3 |
| 181-220 | 8 |
| 221 and above | 12 |
All Class 2 plated parts designed for unlimited life under dynamic loads shall be shot-peened per MIL-S-13165 or MIL-R-81841 prior to plating.
Type 1 - Bright
Type 2 - Satin
Class 1
.00001" min. on all visible surfaces.
Corrosion protection plating.
Class 2
As specified on drawing. If thickness not specified min. thickness shall be .002".
Electroless Nickel
Coatings used typically to provide uniform build-up on intricate shapes. to improve
wear and/or corrosion resistance, or to improve solderability on or for selected materials.
Can be used in service up to 1000 F (540 C) although wear and/or corrosion resistance may degrade as service
temperature increases.Thickness
As specified on drawing. Unless a specific class is specified, Class I shall be supplied.
Class 1
except for hydrogen embrittlement relief, no post plating thermal treatment.
Class 2
Thermal treatment at 450 F (232 C) or above to harden deposit. Hardness shall not be lower that 800 HK100 or equivalent.
Class 3
Thermal treatment at 375 F (191 C) to verify adhesion for non-treatable aluminum and berylium alloys. (1 to 1.5 hours)
Class 4
Thermal treatment at 250 F (121 C) to verify adhesion for heat-treatable aluminum alloys.
| Temperature | Time, Hours |
| 450 F (232C) | 4, Minimum |
| 500 F (260C) | 4, Minimum |
| 550 F (288C) | 2, Minimum |
| 650 F (343C) | 1 to 1.5 |
| 750 F (390C) | 0.5 to 1 |
Grinding
The Grind Division offers precision capabilities in O.D., I.D., and centerless grinding, and has an equipment inventory consisting of 2 O. D., 1 universal, 2 centerless, and 5 I. D. machines.Copper Plate
Copper in color and matte to a very shiny finish. Good corrosion resistance when used as undercoat.
A number of copper processes are available, each designed for a specific purpose. Brightness (to eliminate the
need for buffing); High speed (for electroforming); Fine grain (to prevent casehardening); etc.All steel parts having a hardness of Rockwell C35 and higher shall be baked at 191 +/- 140C (375 +/- 25F) for twenty-four hours after plating to provide hydrogen embrittlement relief. Plated springs and other parts subject to flexure shall not be flexed prior to baking operations.
Sulfamate Nickel
There is a nickel finish for almost any need. Nickel can be deposited soft or hard-dull or bright, depending on process used and conditions employed in plating. Thus, hardness can range from 150-500 Vickers. Can be similar to stainless steel in color, or can be a dull gray (almost white) color. Corrosion resistance is a function of thickness. Has a low coefficient of thermal expansion - is magnetic. All steel parts having a hardness of RC-40 or greater require a post bake at 375 F +/- 25 for 3 hours.
Class 1
NOTE: All steel parts having a tensile strength of 220,000 or greater shall not be plated without specific approval of procuring agency.
For corrosion protection. Plating shall be applied over underplating of copper or yellow brass on zinc based alloys. In no case, shall the copper underplate be substituted for any part of the specified nickel thickness.
- Grade A .0016"
- Grade B .0012"
- Grade C .0010"
- Grade D .0008"
- Grade E .0006"
- Grade F .0004"
- Grade G .0002"
Class 2
For engineering applications.
Lab Support
Our chemistry laboratory supports ChemResearch in numerous ways. Staffed with full time chemists and equipped with sophisticated instrumentation, the lab routinely analyzes our plating solutions. In addition, the laboratory is responsible for monitoring rinse water effluent, air emissions and hazardous materials disposal for compliance with local, state and national regulations.
Racking & Fixtures
CRC is self-sufficient in the area of rack, tooling & fixturing manufacturing. With over 20 years experience and precision equipment, we are confident we can make tooling or fixtures to help our platers meet your specific needs.
Zinc Phosphate Coating (TT-C-490)
Zinc Phosphate coating may be used when paint and supplemental oil coatings are required on various parts or assemblies. Abrasive blasting shall be used prior to phosphating unless otherwise specified.
An excellent base primer prior to the application of paint or powder coat.
For use on aluminum, copper, steel and stainless steel
Type Z - Zinc Phosphate base coating
Class 1 Supplementary preservative treatment or coating specified
Class 2 With supplementary preservative conforming to MIL-C-16173 or MIL-L-3150 (OIL)
Class 3 No supplementary Treatments
Solid Film Lubricant-Dry Lube
This specification establishes the requirements for three types of heat cured solid film lubricants that is intended to reduce wear and prevent galling, corrosion and seizure of base materials
Thickness: As specified on drawing. (MIL-C-46010)