Abstract
The effects of CH<sub>3</sub>COONa and CO<sub>2</sub> on the corrosion behavior of 13 mass% Cr martensitic stainless steel in simulated oil and gas environments were investigated with electrochemical and surface analysis techniques. The electrochemical results showed that a plateau region and sudden increase in the current density of the anodic polarization curves. The current density of the plateau region decreased with increasing CH<sub>3</sub>COONa concentrations. The pitting corrosion potential shifted to the positive direction with increasing CH<sub>3</sub>COONa concentrations, and shifted to a negative value by adding CO<sub>2</sub>. From the surface analysis, a Cr enriched layer had formed on the sample surface after immersion tests, and the thickness of this layer became thinner with increasing CH<sub>3</sub>COONa concentration. The surface analysis results after the immersion tests suggested the presence of CH<sub>3</sub>COO<sup>−</sup> or HCO<sub>3</sub><sup>−</sup> on the surface.
Highlights
Oil and gas fields are very severe environments for metals, and high corrosion resistance and strength steels are generally used
The purpose of this study is to investigate the effects of the concentrations of CH3COONa and CO2 on the corrosion behavior of 13 mass% Cr martensitic stainless steels in simulated oil and gas environments
All curves except for 0 g/L CH3COONa in the presence of CO2 have the plateau region in the current, which implies that the corrosion reaction reaches a temporary steady state
Summary
Oil and gas fields are very severe environments for metals, and high corrosion resistance and strength steels are generally used. Hashizume et al introduced a solution flow type micro-droplet cell and a glow discharge optical emission spectrometer (GDS) to investigate the electrochemical behavior of low carbon 13 mass% Cr welded joints and the effect of a post welded heat treatment (PWHT) in oil and gas environments [17]. They reported that the PWHT eliminated the Cr depleted layer formed during welding, and reduced the SCC susceptibility
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