Page 87 - MetalForming October 2016

release any chemicals.
2) Powder coaters, after they have applied the pow-
der, should extend the time of their normal curing process and allow their ovens to slowly ramp up to curing temperature. This will allow the top layer of powder to remain soft for a longer time, enabling gases to release through the coating before it hard- ens, and avoiding pinholes and bubbles in the finished surface.
Sharing Knowledge is Beneficial
Open communication is vital among platers, coaters and metalformers. Greater knowledge about each other’s processes always leads to better results, reduction of failures and improved cus- tomer satisfaction.
Metalformers, platers and coaters should view each other as partners and keep each other informed about how our processes work. For example, Gatto gives metalformers and coaters a full tour of its 210,000-sq.-ft. facility and a thorough explanation of each of the
The part on the left has been zinc- plated, with a chromate applied over the plating. Thin-film chromate is recommended for parts to be painted after plating, as the film reduces the chance of adhesion issues or bub- bles in the paint. The part on the right has been zinc-plated then coated with a thick-film chromate, which is intended to provide better corrosion resistance on nonpainted parts. How- ever, the powder-coating process will destroy this chromate, likely causing adhesion issues and bubbles or pin- holes.
plating processes. Our specialists describe in detail how products are handled during the plating process, what finishes are used in plating
and what can motivate a change from one particular finish to another.
As technology is constantly chang- ing in both of our industry segments, it is essential that we alert each other when changes that take place in one industry may affect operations in the other. MF
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