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淬火用硝盐由于自加热盐浴中带入氯化物;硝盐本身的分解;工件上的氧化皮掉入等原因,往往使硝盐老化。只要加热后把沉淀物和泡沫等脏东西清
Quenched with salt due to self-heating salt bath into the chloride; nitrate decomposition itself; oxide scale on the workpiece fall into the other reasons, often salt nitrate aging. As long as the precipitate after heating and foam and other dirty things clear