STUDY ON CORROSION MECHANISM OF IRON IN SULFURIC ACID SOLUTIONS CONTAINING HYDROGEN SULFIDE

J Chin Soc Corr Pro

1998, Vol. 18

Issue (4): 269-275 DOI:

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STUDY ON CORROSION MECHANISM OF IRON IN SULFURIC ACID SOLUTIONS CONTAINING HYDROGEN SULFIDE

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Abstract The electrochemical corrosion behavior of iron in H2S-containing sulfuric acid solutions have been studied by potentiodynamic and impedance measurements, and the kinetic equations of cathodic and anodic reactions were obtained. Furthermore, the corrosion mechanisms were proposed according to the results of quantum chemistry calculation. The results indicated that H2S accelerated the dissolution of iron, moreover, the anodic reaction under low applied potential was fast and the corresponding kinetic parametes were:vH+=-0.83, vHS-=0.35, ba ≈40mV. It was also shown that the acceleration extent of H2S for cathodic reaction was smaller than that for anodic reaction and independent on [H2S], and the corresponding kinetic parameters were vH+=1.19, vH2s=0, bc ≈-116mV.

Key words: Iron Hydrogen sulfide CNDO/2 Corrosion mechanism

Received: 25 August 1998

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YAN Li-jing DONG Jun-hua NIU Lin LIN Hai-chao WU Wei-tao(State Key Laboratory for Corrosion and Protection; Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences; Shenyang 110015). STUDY ON CORROSION MECHANISM OF IRON IN SULFURIC ACID SOLUTIONS CONTAINING HYDROGEN SULFIDE. J Chin Soc Corr Pro, 1998, 18(4): 269-275.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1998/V18/I4/269

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