Hikozô Endô1, Akira Itagaki1
This paper contains the results of experiments on the corrosion of copper containing various amounts, Ag, A1, Cd, Co, Cr, Fe, Mn, Ni, P, Sb, Si, Sn and Zn, when immersed in 10 per cent hydrochloric and sulphuric acid solutions. The resistivities of many famous copper alloys against the acids were also studied, and from the results of the above experiments, many alloys were prepared and then compared their resistivities under the same acids at room temperature. According to these experiments, the resistivity of 10% A1-Cu alloy against 10 percent hydrochloric acid was the best and many alloys having better reseistivity than that of Ampco metal were found. In the case of 10 percent sulphuric acid good acid-resisting alloys such as AS4 and AS5 which are better than 10% A1-Cu alloys and Ampco metal were found. The appearance of the specimens of copper, Ampco, Everdur, 10% A1-Cu and newly prepared alloys as attacked after 70 days or 368 hours by 10 per cent hydrochloric and sulphuric acids are respectively shown in photographs.
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