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97417 A SIMPLE MODEL OF CREVICE CORROSION PROPAGATION FOR STAINLESS STEELS IN SEAWATER

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Product Number: 51300-97417-SG
ISBN: 97417 1997 CP
Author: Per Olav Gartland
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Bssed on a previously published computerized model of crevice corrosion initiation, propagation and repassivation for Fe-Ni-Cr-Mo alloys in chloride solutions, a simpler model of crevice corrosion propagation is proposed. The model is deseribed with the use of simple algebraic equations, developed from integral equations for the voltage drop along the passive and active parts of the crevice. The validity of the algebraic equations is to some extent verified with the use of the computerized model. The algebraic equations provide a direct insight into the importanceof the various parameters for the propagation process. The mast important geometric parameter for the total corrosion current is observed to be the average crevice gap in the corroding area, while the original crevice gap in the passive region near the crevice mouth has no influence.The model also predicts the time to repassivation to be proportional to the square of the total crevice depth. The influence of the external potential and the type of stainless steel is briefly discussed. Keywords: Stinks steels, seawater, crevice corrosion,model.
Bssed on a previously published computerized model of crevice corrosion initiation, propagation and repassivation for Fe-Ni-Cr-Mo alloys in chloride solutions, a simpler model of crevice corrosion propagation is proposed. The model is deseribed with the use of simple algebraic equations, developed from integral equations for the voltage drop along the passive and active parts of the crevice. The validity of the algebraic equations is to some extent verified with the use of the computerized model. The algebraic equations provide a direct insight into the importanceof the various parameters for the propagation process. The mast important geometric parameter for the total corrosion current is observed to be the average crevice gap in the corroding area, while the original crevice gap in the passive region near the crevice mouth has no influence.The model also predicts the time to repassivation to be proportional to the square of the total crevice depth. The influence of the external potential and the type of stainless steel is briefly discussed. Keywords: Stinks steels, seawater, crevice corrosion,model.
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Picture for 99320 CREVICE AND PITTING CORROSION BEHAVIOR
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99320 CREVICE AND PITTING CORROSION BEHAVIOR OF STAINLESS STEELS IN SEAWATER

Product Number: 51300-99320-SG
ISBN: 99320 1999 CP
Author: A.E. Zaragoza-Ayala, R. Orozco-Cruz
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Picture for Effect of Temperature on the Crevice Corrosion Resistance of Austenitic Stainless Steels
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51316-7170-Effect of Temperature on the Crevice Corrosion Resistance of Austenitic Stainless Steels

Product Number: 51316-7170-SG
ISBN: 7170 2016 CP
Author: Martin Rodriguez
Publication Date: 2016
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Resistance of S30400 and S31600 SSs to chloride-induced crevice corrosion was assessed in a wide range of temperatures and chloride concentrations. Repassivation potential of S30400 SS decreased with increasing chloride & temperatures from 0 to 60ºC, and it a constant value in the range from 60 to 90ºC regardless of chloride.

 
Picture for Crevice Corrosion Performance of High Grade Stainless Steels and Ni-Based Alloys in Natural And Treated Seawater
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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
Publication Date: 2016
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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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