Letter 12046

NICKEL/ZINC PLATING PROCESS 101 

MY QUESTION IS WHAT IS INVOLVED IN ELECTROLITICAL NICKEL/ZINC COATING OF LOW AND HIGH CARBON STRIP STEEL? OUR CURRENT LINE IS CAPABLE OF ZINC COATING AND COPPER COATING STRIP STEEL WITH A CN CARRIER. I AM INTERESTED IN EXPLORING THE POSIBILITIES OF Ni/Zn COATING. I HAVE NO EXPERENCE IN THIS PRODUCT AND WOULD LIKE TO KNOW IF THE PROCESS IS TO USE A NICKEL ZINC ALLOY ANNODE IN THE PLATING CELLS OR INDIVUAL ZINC CELLS AND NICKEL CELLS. DOES THE PROCESS USE A CN CARRIER OR A CN LESS CARRIER.

PLEASE RESPOND IF YOU CAN HELP ME IN THIS QUEST.

THANK YOU

ALAN F. LEO
- AUSTINTOWN, OHIO USA

Alan,

There are many chemical suppliers of the zinc-nickel plating processes that should be able to help you. Check the finishing services guide book. There are two types of zinc-nickel alloy: a low alloy with a 5% to 12% nickel content and a high alloy with a 13% to 18% nickel content. The high alloy has best corrision protection; however, the low alloy is more ductile and is better suite for parts that may get bend or crimp later. The solution base is sodium hydroxide and I believe there are some acid base processes as well. The process that I use has, which is the NaOH base, has an off-line zinc generator and inert nickel plated steel anodes. Nickel metal concentrate is added based on amphours. There are other process that have separate zinc and nickel anodes in the bath which are controlled by separate power supplies in the same cell.

Karl Weyermann
- Lebanon, KY

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