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氯碱工业以电镀法制得的Ni-Zn活性阴极无论在电化性能、机械性能、制造工艺、成本等方面都显示了较大的优越性。作为活性阴极,要求Ni-Zn以一定比例共电沉积,为了要了解镀层上元素总量,Ni-Zn比例及电镀效率,需要将己镀好的镀层用酸溶解下来,溶解过程中基体的铁板同时被溶解,大量铁的存在(>60%)所产生的严重干扰,无法使用化学分析法来测定Ni-Zn。鉴于原子吸收光谱法的高选择性,本实验采用原子吸收光谱法在燃烧器头转角下测定高浓度的Ni和Zn。此法让光束在有限的火焰区域通过,可使灵敏度下降1/20,即可测
In the chlor-alkali industry, the Ni-Zn active cathode prepared by electroplating method shows great superiority in terms of electrochemical performance, mechanical property, manufacturing process and cost. In order to understand the total amount of elements on the coating, the Ni-Zn ratio and the plating efficiency, it is necessary to dissolve the plating layer that has been plated with an acid and to dissolve the iron of the matrix in the dissolution process The plate was dissolved at the same time, and the presence of a large amount of iron (> 60%) caused serious interference and the chemical analysis was not used to determine Ni-Zn. In view of the high selectivity of atomic absorption spectrometry, atomic absorption spectrometry was used to determine high concentrations of Ni and Zn at the burner head angle. This method allows the light beam in the limited flame area, can reduce the sensitivity of 1/20, that is measurable