分光光度法测量钛合金酸洗液中的钛离子含量

Determination of Titanium ions in Acid Solutions of Titanium Alloy by Spectrophotometry Method

钛合金零件荧光渗透检测前需要在氢氟酸-硝酸溶液中酸洗,以去除钛合金表面的氧化物。本文建立了采用紫外-可见光分光度法测量钛合金酸洗液中钛含量的分析方法,探讨了钛合金酸洗液的前处理方法对酸洗液中钛含量检测的影响。实验结果表明,标准无氟钛溶液和常规酸洗液中的钛的吸收峰均为360 nm,但其含量与吸光度的线性关系系数差别明显,这主要与酸洗液中含氢氟酸有关。对酸洗液进行高温除氢氟酸处理,并使用双氧水与钛离子络合,可以消除氟离子的干扰,钛离子吸收峰在410 nm处,对不同的钛合金酸洗液,其回收率在97.78%~104.18%之间。该方法准确、快速,具有良好的准确度,能够满足日常生产检查需要。

Before fluorescence detection of Titanium alloy components,acid pickling in HF-HNO3 solutions is always required in order to remove the superficial oxides of the components. In this paper,a method of measuring the titanium content in the acid solution was established by ultraviolet visible spectrophotometry method,and investigated the effects of pretreatments on the examinations. The results show that the typical absorption peaks of the standard titanium solutions without F element and the usual acid pickling solutions were both at 360 nm,but their linear parameters of titanium content versus absorbance were different apparently. This phenomenonwas ascribed to the existence of HF in the acid solutions. In order to eliminate the effects of HF,high-temperature treatment of the solution and adding H2O2 to complex Ti ions were conducted,and the absorption peaks of the titanium solutions without F element shifted to 410 nm. The recovery of the method for different acid pickling solutions was 97. 78% ~ 104. 18% for the Ti element. This method was accurate and simple with satisfactory precision and was suitable for routine quality control analysis.