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A Study of Pitting Crevice and Corrosion-Cracking of Cr-Mn-N Austenitic Stainless Steels

A number of warm-worked Cr-Mn austenitic stainless steels with a wide range of Cr Mn and N were first evaluated for pitting and crevice corrosion in both as-received condition and in a post-fluoropolymer thermal cure condition aimed to assess suitability to existing manufacturing processes. Series of immersion tests in a variety of chloride brines and temperatures as well as electrochemical measurements such as potentio-dynamic polarization and electrochemical impedance spectroscopy (EIS) were conducted as means to rank the alloys in chloride-rich environments. Additionally several of these alloys all identified as having higher pitting and crevice corrosion resistance were tested for environmentally assisted cracking in mild sour brine (NACE TM0177 Method A: 1psia H2S 13.5 psia​ CO2 pH 4.0 to 5.0). In summary this study demonstrates Cr-Mn austenitic stainless steels have technical merit for selected oilfield parts; however Cr-Mn steels are also susceptible to sensitization particularly after thermal exposures that may be encountered in fluoropolymer coating. Through a variety of experimental methods including quantitive optical and scanning electron microscopy (e.g. pit size pit counts) correlations were established between alloy composition microstructure and the various forms of corrosion investigated throughout this study.

Product Number: 51319-13012-SG
Author: Tatiana Reyes Ayers
Publication Date: 2019
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