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1978年使用单位反映挤铸产品发生大批锈蚀,一度成为生产交付中的关键,工厂列为各机种重大技术项目之一来攻关。为了查清问题,工厂和使用单位共同派人赴基地现场观察,发现产品不论存放在库房还是野外,都有不同程度的点腐蚀发生,有的油漆层起泡发裂,用针一挑即破,破处有锈蚀坑,大小深浅不一,个别严重的直径可达6～8毫米,深度可达0.5毫米,遍布于整个产品表面,外表面比内表面严重。有的产品出厂后仅一至二年(保管期为三年),有的仅仅几个月便发生了腐蚀。使用单位反映,近年来交付的产品锈蚀情况比过去多而且严重.
The use of units in 1978 to reflect a large number of castings rust, once the key to the delivery of the production, the factory as a major technical project of various models to tackle key problems. In order to find out the problem, the factory and the user jointly sent people to the site to observe the site and found that the products are stored in the warehouse or the field, there are different degrees of pitting corrosion, and some paint blister cracking, with a needle to pick that is broken There are corrosion pits at the broken place, varying in size and depth. Individual serious diameters up to 6-8 mm and depths up to 0.5 mm extend over the entire product surface. The outer surface is more severe than the inner surface. Some products leave the factory only one to two years (storage period of three years), and some corrosion occurred in only a few months. The use of units reflects the rust and corrosion of products delivered in recent years more than in the past.