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October 16 - October 20, 2017

What causes a persistent green/yellow hue on steel that has been exposed for a number of years in close proximity to the ocean, and how should the steel be prepared for painting?

Selected Answers

From Larry Muzia of Exceletech Coating & Applications, LLC on October 17, 2017:
I agree with the above answer; however, I wish to include that it is critical to follow by testing for chloride and invisible contamination before priming by someone knowledgeable in the test protocol .Utilizing very hot water to assist in dissolving the contaminants is also helpful before blasting or using a soluble salt remover

From Patrick Jansen of IFO-Nederland on October 15, 2017:
High humidity and salts is the cause. Prepare by water cleaning at <500 bar (<7000 psi);  blasting to SSPC-SP 10 (Sa 2.5);  or waterjetting to WJ1.

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Tagged categories: Asia Pacific; EMEA (Europe, Middle East and Africa); Latin America; North America; Steel; Surface Preparation; Surface preparation

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