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日本特开昭61—186417A。在热处理钢前,在钢的表面浸涂碱和/或盐溶液。例如,将待退火的铬不锈钢浸入NaOH溶液中涂覆碱液,取出后在氧含量大于5体积％的气氛中加热。使生成的Cr_2O_3转变成可溶Na_2Cr_2O_4,这种可溶鳞皮易溶于HNO_3—HF、
Japanese Patent Laid-Open No. 61-186417A. Prior to heat treating the steel, the surface of the steel is dipped in a base and / or salt solution. For example, a chrome stainless steel to be annealed is immersed in a NaOH solution to coat the lye, which is then heated in an atmosphere having an oxygen content of more than 5% by volume. So that the generated Cr_2O_3 into soluble Na_2Cr_2O_4, this soluble scales easily soluble in HNO_3-HF,