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00827 CREVICE CORROSION BEHAVIOR OF COATED STAINLESS STEEL IN NATURAL SEAWATER

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Product Number: 51300-00827-SG
ISBN: 00827 2000 CP
Author: R. M Kain
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Normally, stainless steels are utilized without any type of coating whatsoever. This report cites a few cases where coatings may be contemplated for use on stainless steels. Of particular interest is the use of various antifouling type coating systems applied over anticorrosion barrier coating systems for seawater service. Testing in natural seawater has demonstrated that coatings can protect susceptible stainless steel from barnacle related crevice corrosion and localized corrosion at weldments. However, coating defects and other unintentional or intentional interfaces with bare metal may create new areas for crevice corrosion to initiate. The risk of serious crevice corrosion damage to the substrate increases with the amount of bare metal exposed. Test results demonstrated that even a relatively small area of bare stainless steel is sufficient to support cathodic reactions that produce crevice corrosion penetrations in excess of 2 mm in less than six months. Even a 6% Mo alloy was susceptible. It was demonstrated that localized corrosion can be prevented by the use of cathodic protection from sacrificial zinc anodes. However, the degree of polarization associated with zinc anodes contributed to blistering and disbonding of the coating in some cases. The current test program did not investigate protection afforded by inorganic zinc-rich primers. Keywords: stainless steel, crevice corrosion, natural seawater, coatings, antifouling, ablative-Cu, elastomeric, epoxy, cathodic protection, zinc anodes
Normally, stainless steels are utilized without any type of coating whatsoever. This report cites a few cases where coatings may be contemplated for use on stainless steels. Of particular interest is the use of various antifouling type coating systems applied over anticorrosion barrier coating systems for seawater service. Testing in natural seawater has demonstrated that coatings can protect susceptible stainless steel from barnacle related crevice corrosion and localized corrosion at weldments. However, coating defects and other unintentional or intentional interfaces with bare metal may create new areas for crevice corrosion to initiate. The risk of serious crevice corrosion damage to the substrate increases with the amount of bare metal exposed. Test results demonstrated that even a relatively small area of bare stainless steel is sufficient to support cathodic reactions that produce crevice corrosion penetrations in excess of 2 mm in less than six months. Even a 6% Mo alloy was susceptible. It was demonstrated that localized corrosion can be prevented by the use of cathodic protection from sacrificial zinc anodes. However, the degree of polarization associated with zinc anodes contributed to blistering and disbonding of the coating in some cases. The current test program did not investigate protection afforded by inorganic zinc-rich primers. Keywords: stainless steel, crevice corrosion, natural seawater, coatings, antifouling, ablative-Cu, elastomeric, epoxy, cathodic protection, zinc anodes
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Crevice Corrosion Performance of High Grade Stainless Steels and Ni-Based Alloys in Natural And Treated Seawater

Product Number: 51316-7196-SG
ISBN: 7196 2016 CP
Author: Dominique Thierry
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To better understand and quantify the effect of crevice geometry, several crevice configurations simulating service conditions were evaluated including flanges assembled with gaskets, bolts mounted with nuts to plates, and the standard CREVCORR-type crevice formers.
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00790 FIELD APPLICATION OF PERFORMANCE ENHANCING CHEMICALS TO METALLIZED ZINC ANODES

Product Number: 51300-00790-SG
ISBN: 00790 2000 CP
Author: Jack Bennett, James B. Bushman, Jorge Costa, Paul Noyce
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00825 CORROSION OF INFRASTRUCTURE WITHIN MADINAT YANBU AL-SINAIYAH, SAUDI ARABIA

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