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在日常检验中马口铁镀钖层重量的测定一般采用碘量法,将钖溶于盐酸后,用碘酸钾标准溶液滴定,在滴定中要避免二价钖被空气氧化,整个测定过程操作步骤多,时间长,本方法采用将马口铁试样浸入热的氢氧化钾稀溶液中,滴加过氧化氢使镀钖层脱掉,然后用失重法,测出镀钖层重量。马口铁中的铁,易容于稀盐酸,同时也会被浓碱溶液侵蚀,因此本方法采用氢氧化钾(5%)稀碱性溶液作为脱钖层的介质,防止了稀酸、浓碱溶液对马口铁中铁板的侵蚀,同时
In the daily inspection of the tinplate coating weight determination generally use iodometry, the dissolved in hydrochloric acid, the potassium iodate standard solution titration, in the titration to avoid the price of divalent sodium oxide is air, the entire measurement process steps and more , A long time, the method uses a tin plate immersed in hot potassium hydroxide dilute solution, dropping hydrogen peroxide plating layer off, and then using the weight loss method to measure the coating weight. The iron in tinplate is easy to dissolve in dilute hydrochloric acid and is also attacked by concentrated alkali solution. Therefore, potassium hydroxide (5%) dilute alkaline solution is used as the medium to separate the layer from the dilute acid solution to prevent the dilute acid and concentrated alkali solution Erosion of iron plate in tinplate, meanwhile