การใช้กรดไขมันเพื่อเป็นสารยับยั้งการกัดกร่อนสำหรับเหล็กกล้าคาร์บอนต่ำ

Nawarat   Worauaychai; Attapon   Tareh

Authors

Nawarat Worauaychai Department of Materials Technology, Faculty of Science, Ramkhamhaeng University
Attapon Tareh Department of Materials Technology, Faculty of Science, Ramkhamhaeng University

Keywords:

corrosion inhibitor, fatty acid, hexanoic acid, octanoic acid, low carbon steel

Abstract

This research is to study the feasibility of two fatty acids, hexanoic acid (HA) and octanoic acid (OA), to be used as the corrosion inhibitors of low carbon steels in acid picking process. The concentrations of acids used in this work were 0, 1, 5, and 20 mM in 0.1 M H₂SO₄. The polarization curve showed that the corrosion potential (E_corr) of carbon steel in H₂SO₄ contained OA shifted to a negative (cathodic) direction. Thus, OA is a cathodic inhibitor controlling cathodic reaction chiefly. The corrosion rate also decreased with OA concentration. On the other hand, H₂SO₄ contained 20 mM HA showed a slightly shift of E_corr to a positive direction and reduce corrosion rate. In comparison with HA, OA at a concentration of 20 mM exhibited the highest inhibition efficiency (%IE) of 72.33% and a lower corrosion rate of 88.95% when compared with the non-inhibitor condition.

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