Electrochemical and corrosion behaviour of nitrogen and boron implanted ARMCO iron

Nuclear Instruments and Methods Pub Date : 1981-04-15 DOI:10.1016/0029-554X(81)90834-X

P.L. Bonora , M. Bassoli , G. Cerisola , P.L. De Anna , S. Lo Russo , P. Mazzoldi , B. Tiveron , I. Scotoni , C. Tosello , A. Bernard

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引用次数: 9

Abstract

The electrochemical behaviour and pitting corrosion resistance of ARMCO iron specimens implanted with nitrogen or boron ions have been studied.

The electrochemical measurements were performed in different solutions in order to characterize material behaviour under most usual work conditions. The following solutions were employed, (a) 0.5M H₂SO₄ deaerated solution, to study the active corrosion; (b) 0.15N H₃BO₃ + 0.15N Na₂B₄O₇ · 10 H₂O, pH 8.5, to study the passivating condition; (c) solution (b) + 2400 p.p.m. of Cl⁻ to study the passivity breakdown; (d) 1M NaCl, pH 4, to study the pitting corrosion.

The implantation affects the anodic dissolution of iron, lowering the intergranular attack and enhancing the protective capacity of the oxide layers, modifying the pit nucleation and growth.

Scanning Electron Microscopy (SEM) was used in order to study the surface morphology.

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氮和硼注入ARMCO铁的电化学和腐蚀行为

研究了氮离子和硼离子注入ARMCO铁试样的电化学行为和耐点蚀性能。电化学测量在不同的溶液中进行，以表征材料在大多数通常工作条件下的行为。采用(a) 0.5M H2SO4脱氧溶液研究活性腐蚀;(b) 0.15N H3BO3 + 0.15N Na2B4O7·10 H2O, pH 8.5，研究钝化条件;(c)溶液(b) + 2400 p.p.m. Cl−，研究钝化击穿;(d) 1M NaCl, pH 4，研究点蚀。注入影响了铁的阳极溶解，降低了铁的晶间攻击，增强了氧化层的保护能力，改变了铁坑的形核和生长。采用扫描电子显微镜(SEM)对其表面形貌进行了研究。

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Nuclear Instruments and Methods

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