General Motors Company

Thin Film; Nanometers Thick (NT) Pretreatment Generic Qualifications - Issue 3; English
 N GMW16170

Annotation

This specification details the general material performance, compatibility, and processing information requirements for international corporate approval of Nano Ceramic Conversion Coatings.

Material Description. Materials qualified to this standard shall meet the performance shown in Appendix A, Table A1. Additional testing and any exceptions to the requirements detailed herein are noted in the Appendix A. Suppliers must demonstrate the technology as being production capable to reduce undue risk prior to release in a production facility. Any material development issues, such as chemical or performance values that fall outside of specified ranges, must be discussed with the appropriate material engineer for resolution. Material must successfully complete a production trial in a target facility prior to release for general use.

Symbols. Not applicable.

Applicability. This specification applies to Nano Ceramic Conversion Coating materials that are intended for use on automotive vehicles. These coatings must provide a corrosion resistant, paint adhesion promoting surface to bare Cold Rolled Steel (CRS), Electrogalvanized (EG) coated steel, Hot Dipped Galvanized (HDG) coated steel, Galvanneal (GA)/Zinc-Iron Alloy (ZnFe), and Aluminum (Al) substrates.

Remarks. In the event of any conflict between the English and domestic language regarding this document, the English language will take precedence. The Nanometers Thick (NT) process bath material is qualified to this standard. However, make-up and replenishment chemicals are to be referenced to this document as well. All chemical materials used in this continuous pretreatment process must be provided by the same supplier.