Review on Systematic Approach to Phosphating and Passivation For Improvement in Surface Properties

mechanical engineering

We outline the ability of zinc phosphate coatings, obtained by chemical conversion, to protect steel against localized corrosion, generated by chloride ions in alkaline media. Phosphating is the most widely used metal pretreatment process for the surface treatment and finishing of ferrous and non-ferrous metals. Due to its economy, speed of operation and ability to afford excellent corrosion resistance, wear resistance, adhesion and lubricative properties, it plays a significant role in the automobile, process and appliance industries. Though the process was initially developed as a simple method of preventing corrosion, the changing end uses of phosphated articles have forced the modification of the existing processes and development of innovative methods to substitute the conventional ones.

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