The Influence of Concentration and Surface Roughness on the Corrosion Rate of 316L Stainless Steel Material in Sulfuric Acid Environment

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Stainless steel 316L (SS316L) is widely used for applications that require corrosion resistance, especially in acidic environments. Despite its importance, the corrosion mechanism of SS316L in concentrated sulfuric acid at room temperature has not been sufficiently studied. In this research, the corrosion behavior of welded and bent SS316L specimens was investigated by varying the surface roughness, achieved by ground using 120-grit abrasive paper and polished until it mirror-like. The specimens were compared through immersion tests for three days at a temperature of 25°C. The chemical composition was analyzed using optical emission spectroscopy (OES), and the microstructure was observed using optical and scanning electron microscopy (SEM). Experimental tests and analysis showed that surface roughness increased the corrosion rate. Increasing the sulfuric acid concentration also increased the corrosion rate, but at a concentration of 50% wt, no corrosion occurred due to the stability of the passive layer.

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Solid State Phenomena (Volume 377)

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23-34

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October 2025

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