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发明公开
CN102605381A 一种奥氏体不锈钢表面铁污染的清洗钝化液及其制备方法 无效 - 撤回

一种奥氏体不锈钢表面铁污染的清洗钝化液及其制备方法
摘要：
本发明涉及一种奥氏体不锈钢表面铁污染的清洗钝化液，该清洗钝化液包括硝酸、双氧水、硫酸亚铁和水，所述成分及体积百分比为：硝酸4～17％；双氧水14～40％；硫酸亚铁含量为：100ml前述物质中含0.1～6mg。所述硝酸可采用质量百分比浓度为60～68％的硝酸溶液，所述双氧水可采用质量百分比浓度为27～38％的双氧水溶液。本发明制备方法是：(1)按比例加入原料，上述硝酸、双氧水及水中卤族元素含量不超过45ppm、硫元素含量在50ppm以下；(2)将硫酸亚铁溶于水中配制成硫酸亚铁溶液；(3)将双氧水、硝酸按比例溶解到硫酸亚铁溶液中，混合搅拌均匀即得成品。本发明操作温度低，可满足核电、化工等行业对奥氏体钢清洗钝化的严格要求。
摘要（英）：

The invention relates to a washing passivation solution of surface iron pollution of austenitic stainless steel. The washing passivation solution comprises nitric acid, hydrogen peroxide, ferrous sulfate and water; the volume percentages of nitric acid and hydrogen peroxide are 4-17% and 14-40% respectively; and 100 ml of the washing passivation solution contains 0.1-6 mg of ferrous sulfate. Nitric acid can be used in the form of nitric acid solution with the concentration by mass percentage being 60-68%; and hydrogen peroxide can be used in the form of hydrogen peroxide solution with concentration by mass percentage being 27-38%. The preparation method disclosed by the invention comprises the following steps of: (1) adding the raw materials according to the ratio, wherein the content of halogen elements in nitric acid, hydrogen peroxide and water does not exceed 45 ppm and the content of sulfur element is less than 50 ppm; (2) dissolving ferrous sulfate into water to prepare a ferrous sulfate solution; and (3) dissolving hydrogen peroxide and nitric acid into the ferrous sulfate solution according to the ratio; and mixing and stirring uniformly to obtain a finished product. The washing passivation solution disclosed by the invention has the advantage of low operation temperature and can meet the strict requirements of industries of nuclear power, chemical industry and the like on washing and passivating of the austenitic steel.

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