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Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Black Phosphate coating attacking zinc coating
We have a Low-carbon steel-black phosphate screw going through a zinc coated disc securing insulation. The discs now seem to be corroding and the rust is coming through the plaster. Does anyone have an idea of how and why this is happening and how can we fix the problem.
Larry Comminshome D-I-Y - Laois, Ireland
March 31, 2011
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