Zinc Plating Processes

Columbia ChemicalSeries of zinc plating processes for chloride zinc plating are designed to offer extremely low foaming characteristics, allowing for air agitation in the plating bath and eliminating staining caused by foam clinging to plated parts. The manufacturer states that the processes have better high-temperature tolerance than most competitive processes and do not become irreversibly insoluble during periods of excessively high operating temperatures.

The series of processes includes:

• COLSID NA-II: a potassium chloride-based, ammonia-free bright acid zinc plating process, designed for rack plating and certain barrel plating applications. The manufacturer states that it offers an exceptional high-current density, burn-free range.
• COLSID K-250: potassium chloride-based plating process for all barrel plating and some rack plating applications. Due to its high cloudpoint, the process can prevent brightener "oil-out" at high operating temperatures.
• COLSID AP: a bright-acid zinc plating process for rack and barrel baths containing ammonium chloride or combinations of ammonium chloride and potassium chloride. It contains a "ductilizer" component that produces highly ductile, bright zinc deposits.
• COLSID AZ-FT: a bright acid zinc plating process for barrel baths containing ammonium chloride or combinations of ammonium chloride and potassium chloride. The manufacturer states that it produces very white zinc deposits and an improved low-current density covering power.

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