マグネシウム合金に防蝕被膜を作る方法
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概要
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Cd-Zn-Mg Alloys, containing a large ammount of Manganese, are considerably resistable, as AZG or AZF, to 3% of salt solution. If these alloys are, however, beated at about 200℃ in air after machining, their surfaces are covered with a certain film which is much more resistable as described below. The average weight loss of the sample which is composed by Cd 4%, Zn 3%, Mn 1.8% and Mg rest %, and heated at about 200℃, is 0.9% to its initial weight of 35 grs (test piece for tension test) by immersion in 3% of salt solution for 28 days and its strength decreased from 23 kg/mm^2. to 19 kg/mm^2. And the corrision which has taken place at two or three pits would be caused by defects of the film, i.e. pitting corrosion. On the contrary, the unheated one, that brings 1.3% of weight loss and 7 kg/mm^2 of reduction of strength, has been corroded generally around the surface. For the study of effects of Cd and Zn on this resistable film, many compositions of Cd-Mn-Mg and Zn-Mn-Mg alloys were prepared. Each of them, heated at 150, 200, 250°, and 300℃ was compared as to its resistibility qualitatively with the unheated one by means of immersion in 3% of salt solution. The results obtained are that Zn up to 2% is harmless on this film, while Cd up to 6% aids to form this film, and the more manganese it contains, the more effective is the film. About 200℃ is the best temperature for heating to produce this film.
- 社団法人日本鉄鋼協会の論文
- 1936-10-25
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