Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Black spots on zinc plating during salt spray test
December 28, 2011
Q. During salt spray test of 5%NaCl solution, I observe black spots after 12 hrs,
is it start of corrosion?
how can I reduce it?
is it serious?
chemical composition of plating material is Sodium cyanide, zinc cyanide and sodium hydroxide.
base metal is MS.
I need your guidance in this regard.
- Lahore, Pakistan
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