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Comparison of Pitting and Crevice Corrosion - The Effect of Alloying Elements

Corrosion resistance of stainless steels and nickel alloys is due to alloying elements. The most important elements are Cr, Mo, N and sometimes W. This paper compares the effect of these elements in pitting and crevice corrosion.

Product Number: 51317--8975-SG
ISBN: 8975 2017 CP
Author: Brian DeForce
Publication Date: 2017
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The localized corrosion resistance of stainless steels and nickel alloys is primarily due to alloying elements. The most important elements as indicated by the Pitting Resistant Equivalent (PRE) are Cr Mo and N. This paper compares the effect of these elements in pitting and crevice corrosion. Using ASTM G48 Methods C and D the critical pitting temperature and critical crevice temperature are determined for several superaustenitic stainless steels (UNS N08367 N08830 N08031) and a nickel alloy (UNS N06625). The varying effect of the elements on the two forms of corrosion and its relation to localized corrosion mechanisms are discussed.

Key words: PRE, ASTM G48, stainless steels, nickel alloys, pitting corrosion, crevice corrosion, localized corrosion

The localized corrosion resistance of stainless steels and nickel alloys is primarily due to alloying elements. The most important elements as indicated by the Pitting Resistant Equivalent (PRE) are Cr Mo and N. This paper compares the effect of these elements in pitting and crevice corrosion. Using ASTM G48 Methods C and D the critical pitting temperature and critical crevice temperature are determined for several superaustenitic stainless steels (UNS N08367 N08830 N08031) and a nickel alloy (UNS N06625). The varying effect of the elements on the two forms of corrosion and its relation to localized corrosion mechanisms are discussed.

Key words: PRE, ASTM G48, stainless steels, nickel alloys, pitting corrosion, crevice corrosion, localized corrosion

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