New salt spray requirement is 336 hours (5% solution per method 811 of FED-STD-No. 151).

Minimum weight for Type 1 Coatings
Class1 200 milligrams/sq. ft.
Class 2 500 milligrams/sq. ft.

Because of thinness, will scratch easily. Can be used for inspection of aluminum forgings or casting by noting evidence of chromic acid bleed out from laps, cracks, seams, etc.

Class 1

Class 2

Dyed.

Shall not be applied to aluminum alloys with over 5.0% copper, 7.0% silicon, or totally alloying constituents over 7.5%.

When copper content is less than 4.6% and for all suitable casting alloys, be sure aluminum is tempered (such as –T4 or –T6)

Class 0
Class 1

Class 2

Class 3
Class 4

.0005”

.0002”
.0001”

For heat treatment stop-off
For carburizing and decarburizing shield, also plated thorugh printed circuit boards.

As an undercoat for nickel and other platings.

To prevent basis metal migration into tin (prevents poisoning solderability).

Class 1
Class 2

Class 3

Grade A

Grade B

.001”

.0005”

As coated.
Steel, copper, nickel, and cobalt base alloys. Heat treated after plating.

Aluminum alloys other than alloy 7075. Heat treated after plating.

Minimum thickness. For iron and aluminum based alloys.

Minimum tickness. For copper, nickel, and cobalt based alloys.

Type I
Type II
Type III
Class 00
Class 0
Class 1
Class 2
Class 3
Class 4
Class 5
Class 6

.00002” min.
.00003” min.
.00005” min.
.00010” min.
.00020” min.
.00030” min.
.00050” min.
.00150” min.

99.7% gold min.
95.5% gold min.
99.9% gold min.
Grade A 90 knoop max
Grade B 91-129 knoop
Grade C 130-200 knoop
Grade D 201 knoop and over

Type I (Grades A, B or C)
Type II (Grades B, C, or D)
Type III (Grade A only)

Class 1

Class 2

Non-dyed.

Dyed

Class1
Type I
Type II
Type III
Type IV
Type V
Type VI
Type VII
Type VIII
Type IX
Type C
Class 2

.002” min.
.00125” min
.00075” min.
.00040” min.
.00050” min.
.00030” min.
.00010” min.
.00125” min.
.00075” min.
.00050” min.

For decorative applications on:
Steel base;
Steel base;
Steel base;
Steel base;
Copper base;
Copper base;
Copper base;
Zinc base;
Zinc base;
Zinc base;
For engineering applications type of nickel (process) should be called out. For salvage and where good hardness and corrosion req.

Type I
Type II
Type III
Type IV

Type V

Type VI

Low temperature.
Medium temperature.
High temperature.
For steels containing large amounts (0.15%) or sulfur or selenium.
Anodic – For high carbon martensitic (440) steels.
Low temperature (optional)

Coating for medium and low alloy steels. The phosphate coating will be uniform in texture, evenly deposited and can be grey to black in color. Provides moderate corrosion resistance and prevents wear.

Reference Material DOD-P-16232

Class 1


Class 2



Class 3

Class 4
 
 

Type M

Class 1
 

Class 2
 
 

Class 3

Class 4

Supplementary preservative treatment or coating, as specified.

Supplementary treatment with preservative conforming to MIL-PRF-16173, Grade 3 or MIL-PRF-3150.

No supplementary treatment

Chemically converted (may be dyed to color as specified) with no supplementary coating or coating as specified .

Manganese Phosphate Base

Supplementary preservative treatment or coating, as specified.

Supplementary treatment with lubricating oil conforming to MIL-PRF-16173, Grade 3 or MIL-PRF-3150.

No supplementary treatment.

Chemically converted (may be dyed to color as specified) with no supplementary coating or coating as specified.

Salt spray requirement is 336 hours (5% solution per method 811 of FED-STD-No. 151).

Minimum weight for Type II coatings:
Class 1 600 Milligrams/sq. ft.
Class 2 2500 Millgrams/sq. ft.

Class 1
Class 2

FED-STD-No. 595 may be used as a Guide for specifying color (approximate comparison only).

Non-dyed
Dyed

Type I
Type II
Type III
Grade A

Grade B

Matte
Semi-bright
Bright.
Chromate post-treatment to improive tarnish resistance.
No chromate treatment.

If a bright finish is desired to be used in lieu of fused tin, specify Bright Tin plate. Thickness can exceed that of fused tin and deposit shows excellent corrosion resistance and solderability.

Type I
Type II

.001-.00025”
.0002-.0004”
.0003” min.
.0002-.0006”

Electrodeposited
Hot dipped.

Flash for soldering.
To prevent galling and seizing.
Where corrosion resistance is important.
To prevent formation of case during nitriding.

Type I

Type II

Type III

The primary purpose of phosphate coating on zinc is to provide a paint base.

Without supplementary treatments

With supplementary chromate treatment

With supplementary phosphate treatment.