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首页> 外文期刊>British Corrosion Journal >Polarisation of low phosphorus AISI 304 stainless steel in H2 SO4 containing arsenite
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Polarisation of low phosphorus AISI 304 stainless steel in H2 SO4 containing arsenite

机译：低磷AISI 304不锈钢在含砷的H 2 SO 4 中的极化

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摘要

The addition of sodium arsenite to an acid solution was found to affect the polarisation and corrosion behaviour of AISI type 304 austenitic stainless steel with a low phosphorus content in deaerated 0·5M H2 SO4 at 50°C. The presence of arsenite drastically changed the anodic and cathodic polarisation behaviour of the stainless steel. The active anodic dissolution of the steel was accelerated at lower arsenite concentrations (1 × 10-4M), but suppressed at higher concentrations. In the former case, an amorphous–crystalline arsenic layer was observed on the surface of the steel under open circuit conditions. All additions of arsenite created a second anodic current peak in the active–passive region at 100 mV (SCE). The extent of the peak depended on the amount of AsO-2 and the immersion time. The peak attained a maximum value of 1845 A cm-2 in the presence of 5 × 10-5M NaAsO2 and a minimum value of 86·0 A cm-2 in the presence of 2·5 × 10-3M. A significant relationship was found between the second anodic peak and the arsenite concentration. This confirmed a previous interpretation that the appearance of the second anodic peak is related to the hydrogenation of the material. By measuring the secondary anodic peak, information about the hydrogenation of stainless steel was obtained. Surface analyses using SEM and X-ray diffraction were carried out.
机译：发现在酸性溶液中添加亚砷酸钠会影响除磷0·5M H 2 SO 4 <时低磷含量的AISI 304型奥氏体不锈钢的极化和腐蚀行为。 / sub>在50°C下。砷的存在极大地改变了不锈钢的阳极和阴极极化行为。在较低的亚砷酸盐浓度（1×10 -4 M）下，钢的活性阳极溶解会加速，但在较高的浓度下会受到抑制。在前一种情况下，在开路条件下，在钢表面上观察到非晶-结晶砷层。所有添加的亚砷酸盐都会在主动-被动区域以100 mV（SCE）产生第二个阳极电流峰。峰的大小取决于AsO - 2 的量和浸没时间。在存在5×10 -5 M NaAsO 2 的情况下，该峰的最大值达到1845 A cm -2 。在存在2·5×10 -3 M的情况下为86·0 A cm -2 。发现第二个阳极峰与亚砷酸盐浓度之间存在显着关系。这证实了先前的解释，即第二个阳极峰的出现与材料的氢化有关。通过测量二次阳极峰，获得了有关不锈钢氢化的信息。使用SEM和X射线衍射进行了表面分析。

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  • 来源
    《British Corrosion Journal》 |1999年第2期|132-138|共7页
  • 作者

    Hermas A.A.;

  • 作者单位

    The Chemistry Department, Faculty of Science, Assiut University, Assiut, Egypt;

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