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| 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 |
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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.
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Received: 2017-06-27
Accepted: 2017-11-02
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Corresponding Authors:
LI Guang-lin
E-mail: liguanglin@swu.edu.cn
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