Study and Determination the Concentration of CNO-Ion of the QPQ with the Sequential Injection Spectrophotometric Method
WU Xin1,2, LI Guang-lin1*, WEN Zhi-yu3
1. College of Engineering and Technology, Southwest University, Chongqing 400715, China
2. Chongqing College of Electronic Engineering, Chongqing 401331, China
3. Micro System Research Center, Chongqing University, Chongqing 400044, China
Abstract:Anew technology of metal surface modification-QPQ (Quench-Polish-Quench) Salt bath compound heat treatment technology can improve theabradability and anticorrosion of metal surface. The CNO-ion plays a very important role in the quality control of QPQ technology. A sequential injection spectrophotometric method is proposed for the determination of CNO-ion. In addition, the indirect detection method of converting CNO-ion into ammonium ion (NH+4) in the condition of high temperature and high pressure is studied; a 697 nm line is selected as the characteristic wavelength. The measuring range of this experiment setup is 0. 02~0. 6 mg·kg-1, and the limit of detection (LOD) is 0.018 mg·kg-1. Based on the sequential injection, the setup can completely automatic on-situ test the concentration of CNO-ion in the quench-polish-quench (techniques for heat treatment of salt bath) process. Measure mean relative error and relative standard variance is 1.31%, 0.92% respectively. Compared with the traditional standard measurement method, a high precision and good repeatability result meets the requirements, which provides theoretical and technical support for the development of the fully automatic in-situ measurement instrument for the treatment of the salt bath compound heat treatment technology.
武 新,李光林,温志渝. 盐浴复合热处理氰酸根顺序注射研究和测定[J]. 光谱学与光谱分析, 2018, 38(06): 1824-1828.
WU Xin, LI Guang-lin, WEN Zhi-yu. Study and Determination the Concentration of CNO-Ion of the QPQ with the Sequential Injection Spectrophotometric Method. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2018, 38(06): 1824-1828.