Study of corrosion properties of carbon steel, 304 and 316L stainless steels in sulfuric acid and their degradation products

Eakapoj KHAMME; Rachsak  SAKDANUPHAB

doi:10.55713/jmmm.v33i4.1672

ผู้แต่ง

Eakapoj KHAMME Department of Manufacturing System Technology, College of Advanced Manufacturing Innovation, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand
Rachsak SAKDANUPHAB Department of Manufacturing System Technology, College of Advanced Manufacturing Innovation, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand

DOI:

https://doi.org/10.55713/jmmm.v33i4.1672

คำสำคัญ:

Sulfuric acid, corrosion properties, carbon steel, SS304, SS316L

บทคัดย่อ

In this study, corrosion properties of carbon steel and stainless steels, and degradation of sulfuric acid by the corrosion mechanism are presented. Carbon steel (CS), 304 stainless steel (SS304), and 316L stainless steel (SS316L) specimens were analyzed through their electrochemical response by using a potentiostat measurement. The specimens were submerged in concentrated 98 wt.% of H₂SO₄ acid for 0 day to 60 day. The degradation of H₂SO₄ was determined by its volume change, turbidity, and color due to the corrosion mechanism. Corrosion rate of CS, SS304 and SS316L specimens are 43.237 mm/year, 0.420 mm/year and 0.086 mm/year, respectively. After 60 days, the weight-loss of CS, SS304 and SS316L specimens are 48 wt%, 33 wt% and 0.1 wt%, respectively. Corrosion resistance of the materials are influenced by the passive oxide layer that forms on its surface and associated with electrochemical activity or semiconductive composition. The degradation of H₂SO₄ acid was observed due to the corrosion process of specimens and related to the turbidity and volume increase while the wt% concentration of H₂SO₄ acid decreases. In order to make material choices that enable continuous and safe operation of the process, it is important to understand the corrosion mechanism changes.

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