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钢中锡为有害元素,会引起钢的性质变差,降低铬铝钒钢的持久强度.其量每增加0.01%,断裂时间缩短10%.原因是锡易在晶界上偏析,造成回火时钢材脆化.所以对钢中锡的测定结果是否正确是至关重要的.微量锡的测定,通常应用化学法、氢化发生-原子吸收法、ICP-MAS法等.化学湿法操作繁琐,试剂耗用多,试剂空白不易掌握;ICP-MAS法仪器昂贵,难以普及.石墨炉原子吸收法作为多种金属元素测定最灵敏技术,为国际标准化组织(ISO)推荐用于碳钢中微量锡的测定.文献[1]报道在测定时,可加入如硝酸镍、硝酸镁、硝酸铰、抗坏血酸和镉等基体改进剂.本文则在前人的基础上,建立了以抗坏血酸作基体改进剂的石墨炉原子吸收法测定铬钢中微量锡,方法简便快速、准确可靠.
Steel tin as a harmful element, will cause the deterioration of the nature of the steel to reduce the lasting strength of chromium-aluminum-vanadium steel, the amount of each increase of 0.01%, the fracture time reduced by 10% because of easy to segregation of tin in the grain boundary, resulting in tempering When the steel is brittle.Therefore, the determination of tin in the steel is correct or not.Determination of tin, chemical methods commonly used, hydrogenation - atomic absorption method, ICP-MAS method, etc. Chemical wet method cumbersome operation, ICP-MAS method is expensive and difficult to popularize. Graphite furnace atomic absorption method is the most sensitive technique for the determination of a variety of metal elements. It is recommended by International Organization for Standardization (ISO) for trace tin [1] reported in the determination of the time, you can add such as nickel nitrate, magnesium nitrate, nitric acid hinge, ascorbic acid and cadmium matrix improvers.In this paper, based on previous studies, the establishment of ascorbic acid as a matrix modifier Graphite Furnace Atomic Absorption Spectrometry for the Determination of Trace Tin in Chromium Steel. The method is simple, rapid, accurate and reliable.