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Crevice Corrosion Performance of High Grade Stainless Steels and Ni-Based Alloys in Natural And Treated Seawater

Picture for Crevice Corrosion Performance of High Grade Stainless Steels and Ni-Based Alloys in Natural And Treated Seawater
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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.

Product Number: 51316-7196-SG
ISBN: 7196 2016 CP
Author: Dominique Thierry
Publication Date: 2016
Industries: Maritime , Science of Corrosion
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$20.00
$20.00

Stainless steels and nickel based alloys are sometimes used for seawater applications in the Oil and

Gas sector. The crevice corrosion performance of selected alloys was investigated in natural and chlorinated seawater, at different temperatures. 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. The crevice geometry was confirmed to be of major importance in terms of risk for initiating crevice corrosion. In natural seawater (i.e. not chlorinated), the most severe temperature was 30°C, due to high biological activity and the increase in the kinetics of corrosion. Chlorination at 0.5 ppm increased the risk of initiation but decreased the rate of propagation of crevice corrosion. In chlorinated seawater, the risk of initiation of crevice corrosion was significantly increased with temperature for all tested alloys. For each of the tested stainless steel configurations, the superaustenitic UNS S31266 showed better crevice corrosion resistance than superaustenitic UNS S31254 and S34565, superduplex S32750, and also nickel-based alloy N06625. The nickel-based alloy UNS N06022 showed better crevice corrosion resistance than all the other tested alloys.

Key words: Crevice corrosion, stainless steels, Ni-based alloys, natural seawater, chlorination, crevice geometry, assemblies

Stainless steels and nickel based alloys are sometimes used for seawater applications in the Oil and

Gas sector. The crevice corrosion performance of selected alloys was investigated in natural and chlorinated seawater, at different temperatures. 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. The crevice geometry was confirmed to be of major importance in terms of risk for initiating crevice corrosion. In natural seawater (i.e. not chlorinated), the most severe temperature was 30°C, due to high biological activity and the increase in the kinetics of corrosion. Chlorination at 0.5 ppm increased the risk of initiation but decreased the rate of propagation of crevice corrosion. In chlorinated seawater, the risk of initiation of crevice corrosion was significantly increased with temperature for all tested alloys. For each of the tested stainless steel configurations, the superaustenitic UNS S31266 showed better crevice corrosion resistance than superaustenitic UNS S31254 and S34565, superduplex S32750, and also nickel-based alloy N06625. The nickel-based alloy UNS N06022 showed better crevice corrosion resistance than all the other tested alloys.

Key words: Crevice corrosion, stainless steels, Ni-based alloys, natural seawater, chlorination, crevice geometry, assemblies

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09194 Evaluation of Crevice Corrosion Resistance of Duplex and Super Duplex Stainless Steels for Seawater Pumps

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The crevice corrosion resistance of duplex and super duplex stainless steels used for seawater pumps was evaluated by comparing the to results tests conducted using actual seawater  with the behavior of the stainless steels in artificial seawater
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Superduplex stainless steels have been used in seawater systems since 1986 as castings and since 1990 as wrought product. The present paper describes some of the service environments commonly in use and the conditions that give rise to specific operating potentials. The limits of use under these conditions are described utilizing both laboratory and service experience.
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Available cast austenitic and duplex stainless steel grades and their castability and corrosion resistance. The conclusion is that superduplex stainless steel offers the best combination of properties for seawater cooling and firewater pumps.

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