GMW GMW18466 PDF

This specification covers the requirements for a black, waterborne autodeposition coating suitable for use on interior bare steel components. Application is by immersion of thoroughly cleaned bare steel. Maximum corrosion protection is afforded by the coating’s ability to form on any bare steel surface that can be wet.

Note: Nothing in this standard supercedes applicable laws and regulations.

Note: In the event of conflict between the English and domestic language, the English language shall take precedence.

Purpose/Material Description.

Four (4) grades of autodeposition coatings are available and are defined as Grades B, C, D, and F as follows:

• Grades B and C are zero Volatile Organic Compound(s) (VOC), waterborne materials that oven cure in the range of (100 to 115) °C.

• Grade D is a very low VOC, waterborne material with a cure temperature of (130 to 190) °C.

• Grade F is a very low VOC waterborne material with a cure temperature of (130 to 190) °C.

All grades are generally used without a topcoat. However, compatible topcoats may be used if acceptable performance is verified prior to production usage. Autodeposition should not be specified for aluminum substrates, galvanized steel, or aluminized steel.

• Grades B and C should not be used when components are exposed to service conditions in excess of 120 °C. Components should be evaluated under operating conditions when the service temperature is between (95 and 120) °C.

• Grade C is intended for use at low film build in interior applications that require only moderate corrosion resistance.

• Grade D has improved resistance to fastener chatter.

• Grade F is similar to Grade C with increased gloss level and heat resistance.

Note: On engineering drawings, this standard requires the grade to be designated which defines the performance level for the coating, (see Section 8).

Symbols.

Not applicable.

Applicability.

A black, waterborne autodeposition coating suitable for use on interior bare steel components.

Remarks.

Volatile organic compound (VOC).

• Grades B and C are VOC free.

• Grades D and F must not exceed 25 g/L.