亞鉛合金の粒間腐蝕の研究

概要

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Intergranular corrosion of metals and alloys has been extensively investigated and one of the current conclusions is the effect of the grain boundary as a function of the orientation of adjacent grains. However, it is believed that impurities may be the most fatal factor in zinc alloys. The authors investigated, therefore, on the various effects of intergranular corrosion of zinc alloys. The results obtained are as follows: (1) intergranular corrosion of zinc alloys may be one of electrochemical corrosion; (2) the monotectoid transformation of Zn-AI binary alloys may not be essential for their intergranular corrosion, because the corrosion exists in Zn-Mg binary alloys having no monotectoid transformation; (3) therefore, zinc alloys may be intergranularly corroded by having a different phase, and the intergranular corrosion may be promoted by impurities such as cadmium, lead and tin, which are more noble in electrode potential than the matrix, and which may bring forth various defects in crystals on account of their low melting points. (Received October 1, 1952)
宇宙航空研究開発機構の論文
1953-01-10