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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.
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
This paper provides an overview of the main properties of duplex stainless steels in terms of chemical composition, mechanical and physical properties. Then, the results of an extensive atmospheric field test program are reported,
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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.
A brief overview of ASTM G48 – "Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride Solution" is used for corrosion testing in the metals industry.