| Search our quarter-million Q&As |
Home of the finishing HOTLINE since 1989
-----Zinc Plating Spec for Ocean Voyage
November 13, 2009
I have been having problems with rust on shipments to China. We are using the customers plating spec for the parts and I need to know if this spec is sufficient for the trip on the ocean. The parts are sheet metal that house electronic equipment. The spec is:
Zinc Plate per ASTM B633,
.0002 in Min., Type ll Passivation; 96 HR Salt Spray Min. and 5 Milliohms per Square Inch Electrical Resistance Max. All surfaces are considered Significant. Trivalent Chromium Based Bath chemistries Shall be Used Until Exception is Provided.
Appreciate any information you can give me. Or if there is a better spec to use I would appreciate that also.
Quality Manager - Bloomingdale, Illinois
0.0002 is not enough thickness to withstand the cold damp humidity and temperature cycles in the cargo compartment of an ocean bound ship. You need at least 0.0003 AFTER a high quality chromate is applied, and be aware that the chromate application, try or hex,removes some thickness.
Robert H Probert
Robert H Probert Technical Services
Garner, North Carolina
November 16, 2009
Thanks Robert I appreciate you taking the time to answer this question.
Dick Webb
- Bloomingdale, Illinois, USA
November 18, 2009
Sorry! Finishing.com is temporarily Read-Only.
Ted Mooney is retiring but I have several offers to take it over.
We're working hard to make sure we find it the best new home.