The focus of this study was the microstructure and heat treatment effect on the mechanical properties of P92 base material and P91 multi-layer weld metal in both as-welded and post weld heat treated (PWHT) condition. Martensitic 9% Cr steels like P91 and P92 can show an increased susceptibility to delayed hydrogen-assisted cracking. A 3% KCl acid solution’s corrosion rate was higher than the corrosion rate of 10% NaOH alkaline solution. Specimens with a post-weld heat treatment (PWHT) process have a lower corrosion rate than those without a post-weld heat treatment (PWHT) process. The corrosion rate at 10% NaOH is included in the excellent category. In alkaline solutions, the corrosion rate trends to be constant, which is in the range of 0.01 mmpy to 0.024 mmpy. The corrosion rate of 3% KCl is in a good category. The 3% KCl solution’s corrosion rate had an upward trend, starting from 0.092 mmpy at 100 hours of immersion time to 0.16 mmpy at 400 hours of immersion time. The specimens were immersed in an acid solution, namely 3% KCl and an alkaline solution, namely 10% NaOH for 100 hours, 200 hours, 300 hours, and 400 hours. The specimens were divided into two, namely specimens that were not subjected to post-weld heat treatment (PWHT) and specimens subjected to post-weld heat treatment (PWHT). The specimens are made from ST37 mild steel which is welded together. This study aims to determine the corrosion rate of mild steel welded joints using acid and alkaline solution media.
One way to overcome this is by predicting the corrosion rate of material under certain conditions. Corrosion is a problem that must be handled in a construction plan.
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