Chemical dissolution of chromium containing oxide forms an integral part of decontamination process development for stainless steel surface in the nuclear industry. In the present article, important process parameters for effective chemical dissolution of chromium containing oxide in dissolved ozone medium were optimized. Simulated corrosion product oxides (chromium containing oxides) were synthesized by combustion route. The dissolution behavior of the chromium containing oxides showed a dependence on process parameter like solution temperature, pH and iron present in chromites. Chemical cleaning at lower pH (~0.01 M HNO₃) helps in release of ‘iron’ and ‘cobalt’ from the chromite lattice. Dissolution of chromite was higher in HNO₃ compared to other acids. Solution temperature optimization for chromite dissolution in dissolved ozone (DOz) medium showed a decrease in the dissolution rate above 70 °C. The DOz process was tested on the three different alloys viz., Incoloy-800 and stainless steel (SS304 and SS316). The oxide film has been dissolved completely by the DOz process with a base metal corrosion rate of 0.010 μm/h for SS304 and Incoloy-800.

含铬氧化物的化学溶解是核工业不锈钢表面去污工艺开发不可或缺的一部分。在本文中，优化了在溶解的臭氧介质中有效化学溶解含铬氧化物的重要工艺参数。通过燃烧路线合成了模拟的腐蚀产物氧化物（含铬的氧化物）。含铬氧化物的溶解行为显示出对工艺参数（如溶液温度，pH和亚铬酸盐中存在的铁）的依赖性。在较低的pH（〜0.01 M HNO ₃）下进行化学清洁有助于从亚铬酸盐晶格中释放出“铁”和“钴”。亚硝酸在HNO _3中的溶解度更高与其他酸相比。亚铬酸盐在溶解臭氧（DOz）介质中溶解的溶液温度优化表明，溶解速率在70°C以上会降低。在三种不同的合金（即Incoloy-800和不锈钢（SS304和SS316））上测试了DOz工艺。对于SS304和Incoloy-800，氧化层已经通过DOz工艺完全溶解，贱金属腐蚀速率为0.010μm/ h。