COMPARISON OF ALKALINE ZN-NI AND ACID ZN-NI AS A REPLACEMENT COATING FOR CADMIUM

Cadmium plating has been used as a corrosion-resistant coating for man y years, providing good corrosion resistance with excellent self-lubri cating properties. Because of concern regarding cadmium's toxicity, al ternative coatings are pursued. Zinc alloy processes are suitable cand idates as substitutes for cadmium for corrosion resistance. Even pure zinc is a suitable substitute, but ifs effectiveness is short-lived Th is article, which is an edited version of a paper that was presented a t the 15th AESF/EPA Pollution prevention and Control Conference (Janua ry 24-27, 1994), documents the testing and investigation undertaken to compare acid and alkaline Zn-Ni processes.