Abstract：The appearance of 200 series stainless steel is similar to that of 304 stainless steel, which is hardly identified by naked eyes. Due to lower price, 200 series stainless steel is usually mixed in food contact tools, bringing uncertainty hazards to food safety. In order to prevent the use of 200 series stainless steel instead of 304 stainless steel, the formulation reagent of 304 stainless steel (identification agent) was developed in experiments to rapidly differentiate 200 series stainless steel and 304 stainless steel. The formulation reagent was modified on the basis of non-energized analytic liquid. In other words, the solid copper sulfate pentahydrate, sulfamic acid and sodium chloride were grinded to below 74μm. Then three reagents above were mixed according to the amount of substance ratio of 1∶4∶12. The mixture was rapidly dissolved with water and then dripped to the polished surface of stainless steel. The sample which turned to be red within 5s was 200 series stainless steel, while the color of 304 stainless steel sample was changeless within 1 min. The developed identification agent was applied for the identification of certified samples of 200 series stainless steel and 304 stainless steel (certified by GB/T 11170—2008) as well as 50 stainless steel samples which were randomly selected in supermarket. The identifying results were consistent with those obtained in laboratory. This formulation reagent was produced by mixing three solid substances, and it was more environmental, safe and convenient. The developed identification agent was applicable for the on-site identification of 200 series stainless steel and 304 stainless steel.
王娇娜, 周西林, 刘迪, 苏中华, 黄晴晴. 304不锈钢与200系列不锈钢识别剂的研制及其应用[J]. 冶金分析, 2018, 38(1): 47-52.
WANG Jiao-na, ZHOU Xi-lin, LIU Di, SU Zhong-hua, HUANG Qing-qing. Development and application of identification agent for 304 stainless steel and 200 series stainless steel. , 2018, 38(1): 47-52.
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