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Influence of acetylenic derivatives on corrosion of chromium and chromium containing steels in hot acid solutions

机译：炔属衍生物对热酸溶液中铬和含铬钢腐蚀的影响

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摘要

The influence exerted by some acetylenic alcohols (1-octyne-3-ol (OCT), 3-methyl-1-butyne-3-ol (MET), and 1-iodo-3-methyl-1-butyne-3-ol (IOD)) on the corrosion of chro mium in a 1N HCl solution at 70°C has been evaluated by electrochemical impedance spectroscopy (EIS) measurements and polarisation curve determinations. These compounds are poor inhibitors of the dissolution of chromium in acid, despite the positive benefits obtained for other transition metals such as iron or nickel. Only OCT, at a 10 mM concentration, displays a highly protective action, but this decreases rapidly during the first two hours of testing. Even the inclusion of modest amounts of chromium in iron alloys is sufficient to reduce the inhibitive effect of acetylenic alcohols. For instance, the protective action of OCT is high and persistent only for plain steel, and it decreases rapidly for alloys with chromium contents of 5–17%. The negative influence of dissolved Cr3+ ions has also been demonstrated, since their presence causes a reduction in the inhibiting efficiency of OCT on both plain and chromium containing steels.
机译：某些炔醇（1-辛炔-3-醇（OCT），3-甲基-1-丁炔-3-醇（MET）和1-碘-3-甲基-1-丁炔-3-醇）产生的影响（IOD））在70°C的1N HCl溶液中对铬的腐蚀已通过电化学阻抗谱（EIS）测量和极化曲线确定进行了评估。尽管获得了其他过渡金属（如铁或镍）的积极益处，但这些化合物还是铬在酸中溶解的不良抑制剂。只有浓度为10 mM的OCT才显示出高度的保护作用，但是在测试的前两个小时内这种作用迅速降低。即使在铁合金中包含少量的铬也足以降低炔醇的抑制作用。例如，OCT的保护作用仅对普通钢是高而持久的，而对于铬含量为5-17％的合金，OCT的保护作用迅速降低。还已经证明了溶解的Cr 3 + 离子的负面影响，因为它们的存在会降低OCT对普通钢和含铬钢的抑制效率。

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  • 来源
    《British Corrosion Journal》 |1999年第3期|214-219|共6页
  • 作者

    Frignani A.; Monticelli C.; Trabanelli G.;

  • 作者单位

    The Aldo Daccò Corrosion Study Centre, Chemistry Department, University of Ferrara, Via L. Borsari 46, I–44100 Ferrara, Italy;

    The Aldo Daccò Corrosion Study Centre, Chemistry Department, University of Ferrara, Via L. Borsari 46, I–44100 Ferrara, Italy;

    The Aldo Daccò Corrosion Study Centre, Chemistry Department, University of Ferrara, Via L. Borsari 46, I–44100 Ferrara, Italy;

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