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Abstract The corrosion behavior of YB45 steel (0.485%C; 0.59%Mn;0.28% Si;0.012% S and 0.02%P)in HC1 up to 12 N and the inhibiting effect of different concentrations of hexamethy-lenetetramine (U) and 2, 4, 6-trimethyl-pyridine (TMP) added singly and in combination to 8.7N HCl were studied by the classica potentiostatic polarization method at 25℃. For acid concentrations above 8.7N without inhibitors, the cathodic polarization curves nearly coincide so that corrosion rates increase less significantly with increasing acid concentrations. In 8.7N HCl,U is a strong cathodic inhibitor while TMP is far less efficient. When the two inhibitors are used in conjunction, only additive effect can be observed,but some impurities inTMP in appreciable amount will cause strong synergism.These phenomena are explained by saturated adsorption of H~+Cl~- "molecules" in concentrated HC1 and the further adsorption of U on H~+Cl~- layer at the Fe/solution interface.
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Received: 25 April 1983
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Cite this article:
Lei Hongyi Dong Yuanyan Wang Baocheng and Yang Wenzhi(Chemistry Department; Beijing University). THE MECHANISM OF CORROSION AND INHIBITION OF STEEL IN CONCENTRATED HYDROCHLORIC ACID IN THE PRESENCE OF TMP-AND UINHIBITORS. J Chin Soc Corr Pro, 1983, 3(2): 85-96.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1983/V3/I2/85
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