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Ted Mooney, P.E. RET
Pine Beach, NJ

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Influence of surface finishing on AISI 316 on corrosion resistance in marine environments

2006

We are studying corrosion resistance on instrument tubing and are wondering if there have been any changes in surface treatment the last couple of decades that might alter the corrosion resistance. There has been more pitting on newer (97-02) tubing, compared to older tubing with the same material. What is most common surface treatment on instrument tubing on 316 offshore? What is the best treatment to prevent pitting?

Yours faithfully

Maren Blomset
and Monika Næss

Maren Blomset

2006

Apologies for the late reply. Some blame the reduction in corrosion resistance in stainless steels on higher impurity content due to an increase in the amount of scrap iron used in the production of the steel. This effect seems to be especially problematic for Chinese stainless steel.

Corrosion/pitting prevention remains as it has always been, passivation with a nitric or citric acid based bath or paste.

Ray Kremer
Stellar Solutions, Inc.

McHenry, Illinois

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