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Protection of aluminium by chemical nickel plating against corrosionprovoked by mercury – effect of fixing coat

机译：化学镀镍保护铝免受汞腐蚀–固定涂层的作用

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The aluminium structures are often met in the oil installations and for certain producercountries of oil, this matter contains a certain mercury rate. Like, Aluminium in contact with this metalis degraded by amalgamation [1, 2], much of efforts are provided to trap mercury upstreaminstallations in question by the means of specific absorbers [3, 4]. However, this trapping is not total,and corrosion by mercury even with the state of traces always threatens.In this context, and for the intention of preserving these installations even in the presence ofcorrosive metal, we recommended a solution which consists in applying a metal chemical nickelcoating using the sodium hypophosphite like reducer. The choice of this process is especially dictatedby the complex geometry of the parts to protect [5]. Indeed, the metallization of aluminium requiresfixing coat; in our case the latter is also selected out of nickel and is deposited by 'displacement'starting from an acid bath containing of nickel sulphate in strong concentration. In experiments, it wasnoted that 'displacement' is not carried out instantaneously, but rather gradually according to time. Socovering was followed in two manners: initially for durations of treatment ranging between 10 and 50minutes per step of 10, then for lower durations between 2 and 8 minutes per step of 2.In the first case,the total treatment (chemical fixing coat + nickel plating) was fixed at one hour, whereas in the othercase this same time was reserved only for nickel plating (external deposit).The deposits carried out were characterized by the impact of shock thermal tests for theappreciation of their adherence, and by examinations under the optic microscope and the SEM. Thisstudy was supplemented by tests of corrosion in saline medium and in the presence of mercury byusing the layouts of the curves of potential according to time and the curves intensity-potential.The results obtained show that the fixing coat improves in a significant way adherence and thebehaviour with corrosion of the final deposit. The optimum result corresponds to a displacementcarried out below 10 minutes.
机译：铝结构经常在石油设施中使用，对于某些石油生产国来说，此物质含有一定的汞含量。像铝一样，与这种金属接触的铝会由于汞齐化作用而降解[1，2]，因此通过特殊的吸收剂[3，4]付出了很多努力来捕集有问题的上游汞。但是，这种捕集并不完全，即使在痕量状态下，汞的腐蚀也始终存在威胁。在这种情况下，并且为了即使在有腐蚀性金属的情况下也要保留这些设备，我们建议采用一种解决方案，包括使用金属使用次磷酸钠之类的还原剂进行化学镀镍。该过程的选择尤其取决于要保护的零件的复杂几何形状[5]。确实，铝的金属化需要固定涂层。在我们的情况下，后者也是从镍中选择的，并通过“置换”从含有高浓度硫酸镍的酸浴开始沉积。在实验中，注意到“位移”不是立即进行的，而是根据时间逐渐进行的。覆盖的方法有两种：首先进行10分钟至10分钟至50分钟的治疗，然后每2分钟进行2至8分钟的较低治疗。在第一种情况下，总处理（化学固定涂层+镍镀层）固定在一个小时，而在其他情况下，此时间只保留给镍镀层（外部镀层）。进行镀层的特点是冲击热测试对附着力的影响，以及在光学显微镜和SEM。通过使用根据时间的电位曲线和强度-电位曲线的布置，补充了在盐水介质中和存在汞的腐蚀试验的结果。结果表明，固定涂层显着改善了附着力和性能最终沉积物被腐蚀。最佳结果对应于在10分钟以下进行的位移。

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  • 来源
    《》|2004年|1-7|共7页
  • 会议地点 Nice(FR)
  • 作者

    Farès C.; Merati A.; Belouchrani M.A.;

  • 作者单位

    Electrochemistry and Corrosion Laboratory EMP BP17 Bordj El Bahri 16111 AlgiersAlgeria email: chahinezfares@yahoo.fr;

    Electrochemistry and Corrosion Laboratory EMP BP17 Bordj El Bahri 16111 AlgiersAlgeria email:merati_djamel@yahoo.fr;

    Engineering Materials Laboratory EMP BP 17 Bordj El Bahri 16111 Algiers Algeria email: nbelouch@yahoo.fr;

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  • 关键词

    Chemical plating; Nickel; Aluminium; Mercury; Fixing layer;

    机译：化学镀；镍;铝;汞;固定层;

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