ASTM B633 Type ??, Class??, ILO QQ-Z-325, Type II, Class 3 2

[engamopar]

We have a requirement to ZINC plate an item per QQ-Z-325, Type II, CLASS 3. (spec now cancelled). What TYPE, Class, etc. per ASTM B633 would replace it.

 

[JLSeagull]

I think that the QQ spec appied to the thickness required and whether chromated or not. I used it about a generation ago.

 

[JLSeagull]

A quick Google shows that QQ-Z-325 Type II includes supplementary chromate treatment and Class 3 thickness, 0.0002".

ASTM B 695 reflects classes 5 through 110 in terms of the thicknes in micrometers. Type II is with colored chromate conversion treatment per appendix X2.2.

 

[Billybaru]

I believe an equivalent ASTM B633 callout is Type II, Class Fe/Zn5. Note that ASTM B695 is a mechanical zinc coating, not an electroplate such as B633 and the old QQ-Z-325.