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- W5233597 abstract "It is a well-known fact that copper and its alloys are corroded by commercial methanol and that black-brown corrosion products are formed on their surfaces. In this paper these corrosion products are examined by the electron diffraction method. Two kinds of specimen, which are made from American and Japanese copper, are immersed into methanol after removing the surface polished layer by etching. There is a remarkable difference between corrosion of two specimens. The color of the corroded surface of the American copper is red-purple after a few day’s immersion, while that of the Japanese copper is black-brown after immersion for the same period, but the corrosion-products of both cases are the same: in both cases films of the cupric and cuprous oxide are formed on the surfaces at an early stage of corrosion, but after the long period of corrosion only the former remains. The diffraction rings of the corrosion products are always so diffused and faint that it is very difficult to measure diameters of the rings, hence, the accuracy of the lattice spacings is diminished. When the contained water is removed from commercial methanol by calcium oxide and metallic sodium and by distillation, the appearance on the copper surface immersed into the purified methanol remains unchanged after a long period of immersion, and yet the diffraction patterns from these surfaces show the existence of the copper oxide. At any rate, the usual corrosion of commercial methanol can be prevented by removing the contained water, while the appearance on the copper surface immersed into water for a long period does not change so much a that of the copper surface immersed into the unpurified methanol for the same period. This means that a small quantity of unknown impurities, which are soluble in water, is active and promotes the oxidation of the copper surfaces, and so after removing water the considerable oxidation does not occur, although there exists a very thin film of the copper oxide, which can be detected only by the electron diffraction patterns. Consequently, it is concluded that a different mechanism from that previously proposed(1) must be considered." @default.
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- W5233597 date "1950-01-01" @default.
- W5233597 modified "2023-10-14" @default.
- W5233597 title "Study on the Methanol Corrosion of Copper by Electron Diffraction" @default.
- W5233597 doi "https://doi.org/10.2320/jinstmet1950b.14.11_31" @default.
- W5233597 hasPublicationYear "1950" @default.
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