Study on corrosion mechanism of carbon steel induced by Galvanic coupling in inhibitor solution

J Chin Soc Corr Pro

2008, Vol. 28

Issue (2): 90-94 DOI:

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Study on corrosion mechanism of carbon steel induced by Galvanic coupling in inhibitor solution

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长江大学化学与环境工程学院

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Abstract The adsorption behavior of imidazoline derivative as a cationic inhibitor for inhibiting galvanic corro?鄄sion has been investigated by using electrochemical methods, atomic force microscopy (AFM) and Fourier trans?鄄form infrared spectroscopy (FTIR) technology. The results show that the inhibitor adsorbs on the surface of carbon steel while it does not adsorb on the surface of stainless steel in aqueous NaCl solution. When the two metals are electrically coupled in NaCl solution, the inhibitor can adsorb to the surface of both carbon steel and stainless steel. However, in this case, the surface coverage of the inhibitor film formed on the carbon steel decreases com?鄄pared with that on the surface of single carbon steel immersed in the same electrolyte, and the adsorbability of the inhibitor on the surface of carbon steel is weakened. The corrosion failure for carbon steel of the couple at?鄄tributes to the decreases of both coverage and adorability of the inhibitor adsorbed on the metal surface.

Key words: AFM Galvanic corrosion FTIR Cationic inhibitor adsorption Electrochemical method

Received: 01 August 2006

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. Study on corrosion mechanism of carbon steel induced by Galvanic coupling in inhibitor solution. J Chin Soc Corr Pro, 2008, 28(2): 90-94 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2008/V28/I2/90

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