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钢中的铝成固溶铝、氮化铝、氧化铝、硅酸铝形式存在。固溶铝、氮化铝可以溶解于稀硫酸(1+9)中;氧化铝、硅酸铝则不溶解。测定酸不溶铝即是氧化铝、硅酸铝中的铝含量。但是ASTM 1971年及以后的版本撤销了E30-56中测定钢中铝的方法,E350-71,E353-70只进行总铝的分析,不再区分酸溶及酸不溶铝,从而可以说明在测定酸不溶铝时存在着问题。 1969年日本标准钢中铝的测定,在同一标准不同的方法中,处理酸不溶铝的溶解酸也不一样,在
Aluminum in steel into solid solution of aluminum, aluminum nitride, aluminum oxide, aluminum silicate exists. Soluble aluminum, aluminum nitride can be dissolved in dilute sulfuric acid (1 +9); alumina, aluminum silicate is not dissolved. Determination of acid insoluble aluminum is alumina, aluminum silicate aluminum content. However, ASTM version 1971 and later revoked the method for the determination of aluminum in E30-56. E350-71 and E353-70 only analyzed total aluminum, no longer distinguishing between acid-soluble and acid-insoluble aluminum, There is a problem with acid insoluble aluminum. 1969 Japanese standard steel in the determination of aluminum, in the same standard of different methods, the treatment of acid-insoluble aluminum acid is not the same, in