Zinc plated components vary from one industry to another. They share, however, the most basic of metal finishing needs: durable finish; aesthetically pleasant appearance; and cost effective processing. The designer and engineer must take into account several considerations to stay at the forefront of the finish potential. Not the least of which is the environmental regulations impact on the future of the selected finish.
This specification covers requirements for electrodeposited zinc coatings applied to iron or steel articles to protect them from corrosion. It does not cover zinc-coated wire or sheets. High strength steels (tensile strength greater that 1700 MPa) shall not be electroplated. Stress relieve all parts with ultimate tensile strength 1000 MPa and above at minimum 190°C for three (3) hours or more before cleaning and plating. Hydrogen embrittlement relieve all electroplated parts of 1200 MPa tensile strength or higher by baking at 190°C for three (3) hours or more within four (4) hours after electroplating.
Supplementary treatments shall be in accordance with Recommended Practice B201. Type IV shall be in accordance with Recommended Practice D2092.
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