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topic 528

Patchy hardcoat anodization


We out-source hard coat anodize operation on a machined AA354.0 alloy. We are experiencing problems with 'patchy anodization' localized regions on the part that does not exhibit presence of oxide layer. This seem to be localized on one region in the part. Any help to indicate where this problem can be coming from - pressure die cast or anodizing operation will be greatly appreciated. What should be the approach in determining root cause?

Ganesh Raj
automotive components - Wylie, Texas


We have seen similar defects and attribute it to the residual silicone-based mold release agent. Very good degreasing prior to anodize will resolve the problem. Alternately, you may chose to change the release agent in your casting operations.

Max Stein
jobshop plater - Montreal, Quebec

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