Metal surface finishing is a major manufacturing industry which provides weather and wear-resistant products; however the volume of hazardous and toxic waste streams produced from metal surface finishing operations is significant. Common products undergo more than ten finishing steps that include degreasing and cleaning for oil removal from the surface, etching, pickling, plating, and rinsing. The elimination of the any of the surface processing steps reduces processing costs, waste production and energy consumption. Also, common processing techniques often utilize toxic chemicals for cleaning and plating.
The purpose of this white paper is to review cathodic corrosion protection, common techniques for depositing zinc coatings, alternative chemicals that can be used for plating, and alternative techniques for metal deposition that result in substrate surface modifications and eliminate one or more steps that are associated with traditional plating or galvanizing process.
Aksamija, A. (2010). "Alternative Finishing Processes for Metals: Environmental Implications". Tech Lab Annual Report 2010, pp. 60-68. http://www.perkinswill.com/research/tech-lab-annual-report-2010.html