Chromium-free inactivating liquor for continuous galvanizing by hot-dip galvanized steel sheet

连续热浸镀锌钢板用的无铬钝化液

Abstract

The invention relates to a chromium-free passivation solution used for continuous hot dipping coating of galvanized steel sheet, which belongs to the technical field of metal surface treatment and corrosion prevention. The compositions and the mixed ratio in one liter of the passivation solution are as follows: 3 to 5 grams of molybdate, 5 to 15 grams of tungstate, 3 to 5 grams of tannic acid, 5 to 20 grams of citric acid, 10 to 30 grams of hydrogen peroxide, 10 to 30 grams of silicate, 20 to 30 grams of pH value regulator, and the balance being water. The chromium-free passivation solution has the following advantages: as no chromium is contained, the chromium-free passivation solution has no effect on a human body and the environment, and has low cost which is equivalent to that of a chromate passivation solution and is approximately 30 percent of that of the chromium-free passivation solution used in the prior art, thus the cost is less than one tenth that of the chromium-free passivation solution containing 80 to 160 grams of the molybdate per liter and 16 to 32 grams of the tungstate per liter in the prior art; besides, the salt spray corrosion resistance of the passivated galvanized steel sheet can meet the requirement of national standard with the corrosion area of a 72-hour neutral salt spray test less than 5 percent; and the chromium-free passivation solution not only does not change the prior process conditions, but also does not change the prior equipment in use.
一种连续热浸镀锌钢板用的无铬钝化液,属于金属表面处理与防腐蚀技术领域。其组分和配比为:钼酸盐3~5g/L,钨酸盐5~15g/L,单宁酸3~15g/L,柠檬酸5~20g/L,双氧水10~30g/L,硅酸盐10~30g/L,pH值调节剂20~30g/L,其余为水。优点:由于不含有铬,因此对人体及环境无影响,成本低廉,与铬酸盐钝化液成本相当,约为已有技术中使用的无铬钝化液的30%,因此比已有技术中的组分中含有钼酸盐80~160g/L和钨酸盐16~32g/L的无铬钝化液成本下降10倍以上,而且钝化后的镀锌钢板耐盐雾腐蚀性能满足国家标准的要求,72h中性盐雾实验腐蚀面积小于5%,使用时既不改变原有工艺条件也不改变原有的使用设备。

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Cited By (9)

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