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我厂在采用炭坩埚炉熔炼铝合金时,由于吸气严重,铸件时常出现针孔,特别在南方的霉雨季节,由于空气中的湿度大,产生针孔尤其严重,致使大量的铸件报废.虽然曾采用过氯化锌、四氯化碳、六氯乙烷、通入70%氮气和30%氯气混合气体等除气办法处理,但始终无法彻底解决问题.一九六六年,我们采用真空处理去气,才彻底解决了问题,后来我们将焦炭炉改为电阻炉,效果更好,目前生产中铸件没有因针孔而报废的.
I plant carbon crucible furnace smelting aluminum alloy, due to serious inspiratory, often appear pinhole casting, especially in the southern moldy season, due to the humidity in the air, resulting in pinhole is particularly serious, resulting in a large number of castings scrapped. Although the treatment of outgassing with zinc chloride, carbon tetrachloride, hexachloroethane, mixed gas of 70% nitrogen and 30% chlorine has been used, it has not been possible to completely solve the problem. In 1966, we adopted Vacuum treatment to the gas, it completely solve the problem, and later we will change the coke oven resistance furnace, the effect is better, the current production of castings not pinhole and scrapped.