GMNA GM264M PDF

This specification covers the materials and processing required to chromium plate aluminum wheels and trim. Plating durability requirements are also included. This specification applies for all cast and forged wheels and could also be used for some metallic trim on wheels.

Parts produced to meet these requirements have been validated to meet GM's cosmetic corrosion expectations after 3 years of accelerated corrosion testing on durability vehicles at GM's Milford Proving Ground, exposed to the 95th percentile corrosive environment, e.g., northeast United States or Maritime Provinces of Canada.

While not all surfaces of a three dimensional part can be exposed at the prescribed test angles, all exposed surfaces must be evaluated for compliance to the requirements. In order to evaluate a wheel to this specification, a part drawing is required so that the analyst can select the appropriate tests for the various plated, partially plated, and painted surfaces.