Porcelain Enamel

In one of our products, we are using a block of cast aluminum as a heat exchanger and we would like to try to coat the aluminum with porcelain enamel. We have been told that this cannot be done because the high temperature of porcelain enameling would destroy the aluminum.


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Q. We manufacture heat exchanger components for various industrial applications. In one of our products, we are using a block of cast aluminum as a heat exchanger. To protect the surface from corrosion and mineral deposits from water contact, we would like to try to coat the aluminum with porcelain enamel. We have been told that this cannot be done because the high temperature of porcelain enameling would destroy the aluminum. S. R.

 

A. As I understand it, the problem with applying porcelain enamel to aluminum is that the high temperature required to fuse the frit may weaken the aluminum and if high enough would cause it to melt. Certainly there are low temperature sintering aluminum frits that can be used on aluminum. But enough philosophy and conjecture. I am an organic chemist, not a ceramist. I suggest you contact suppliers of porcelain enamel frit for a low temperature porcelain enamel for aluminum. 

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