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Phosphating on steel parts

What is the correct procedure & composition of phosphating bath? Is there any difference between zinc phosphating & black phosphating? Is there any post treatment required to get best result on alloy steels?

Masood Akhter
- Abu Dhabi , U.A.E.

The procedure of Zinc Phosphating is big and long story and here we cannot give you all the details , I suggest you will read Metal Finishing Directory for it , and there you will get some idea for Zinc Phosphate. The difference between Black Zinc Phosphate and usual Zinc Phosphate is the color of the coating . The Zinc Phosphate's color is from light gray to dark gray . The black zinc phosphate is achieved by one stage before the Zinc Phosphate stage which create the black zinc phosphate coating.

Yehuda Blau
YB Plating Engineering and Quality - Haifa Israel

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