Predicting Durability of Decorative Chromium Plating in Minutes with the Electrolytic Corrosion (EC) Test

Understanding obtained through a research study of corrosion of decorative chromium plating systems is reviewed. From this knowledge, the development of an electrolytic corrosion test (the EC test) is traced. Measurements of corrosion sites show that electrolysis for 2 min (6 min elapsed time) in the EC test produces corrosion sites more like those from one year of Detroit service than those produced in 16 h of CASS test exposure. The EC test has been employed for four years with satisfactory results as a monitor of durability of automotive parts plated in a production line.

The paper outlines the mechanism by which nickel corrodes, describes the EC test equipment, and gives the results of an evaluation made by GM production personnel.