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There is no need to seuy that the use of aluminum alloy as a material of super-structure of sea-going vessel much contributes to the increase in loading capacity and improvement of transverse stability of the vessel. In this case, however, it is required that any appropriate measure should be taken to prevent the galvanic corrosion on the surface of the aluminum where steel material contacts with.Thri is to report the results of the several tests which have been made by ourselves to know what kind of treatment shoued be made on the surface of steel material to avoid the occurauce of the corrosion on aluminum most effectivly.The lists made by contacting galvanized steel sheet, steel sheet plated with zinc, one plated with cadmium, ziuc metalicon, aluminum metalicon and non-treated steel sheet each with anodized 52S aluminum alloy and non-treated one.Dipping each of the above mentioned test-piece, as contacted with aluminum alloy, into the solution of 1mol MaCl+3%H2O2, we measured the decrease in volume and lowering of stress by corrosion of the aluminum alloy. The results showed that the zinc plated steel is the most favorable material for this purpose, and next comes zinc metalicon, Al metalicon, galvanized steel, and cadmium plated steel in orders. We found that the non-treated steel was not suitable for the purpose. And we confirmed, in this test, that the anodized aluminum loss much stronger corrosion resistanse than non-treated one. |
