Results here of an effort to identify a potentiodynamic means of inducing corrosion in laser-etched areas of stainless steel tools. The electrochemical technique should be able to distinguish between “good” and “bad” etches relatively quickly so that it may be used to help refine the laser etch process, and ultimately assist in quality assurance.
Corrosion behavior of austenitic stainless steel UNS S30400 (SS304) and austenitic stainless steel UNS S31603 (SS316L) was investigated to confirm, for the same chemicals and metallurgies, that electrochemical impedance spectroscopy (EIS) could be used as a tool to investigate the compatibility of neat chemical with stainless steels.
In order to meet growing energy demand, oil and gas industries are facing many challenges, including the exploitation of increasingly deep fields with high pressure and high temperature in sour environments containing CO2 and H2S. Operators must carefully select materials that are resistant to these aggressive environments. The main risk associated with the use of martensitic stainless steels is the risk of sulfide stress cracking under well shut-in conditions.
The aim of this study is to evaluate the performance of supermartensitic stainless steels (13Cr-5Ni- 2Mo) based on NACE TM-0177-2016 method A and alternative methods such as slow strain rate test according to TM-0198-2016 and ripple strain rate test. Cyclic potentiodynamic polarization measurements were also performed to evaluate pitting and repassivation performance. The interest of this study is to present reliable and fast criteria to predict sulfide stress cracking performance of supermartensitic stainless steels through alternative methods. The effect of buffer and chloride content on pitting resistance and sulfide stress corrosion cracking resistance will also be discussed as well as the effect of Mo and Cr on pitting resistance.