Effect of Copper-Ammonia Complex on the Oxygen Removal and Corrosion Inhibition Performance of Diethylhydroxylamine

doi:10.16183/j.cnki.jsjtu.2021.171

Abstract

Abstract:

The catalytic effect of copper-ammonia complex on the deoxygenation efficiency of diethylhydroxylamine (DEHA) and the corrosion protection ability of the compound on carbon steel are studied. The effects of the addition of catalyst, and the pH and temperature of water on the deoxygenation performance of DEHA are investigated. The results of the deoxygenation test show that the deoxygenation rate of DEHA increases with the increase of the pH and temperature of water. The deoxygenation effect is greatly improved after the addition of catalyst. The optimal concentration of copper ammonia complex is 8 mg/L. Under these conditions, when the water pH≥7 or the water temperature is in the range of 30 ℃ and 70 ℃, the oxygen removal rate can reach more than 95%. The corrosion inhibition test results show that the copper-ammonia complex can significantly improve the corrosion protection ability of DEHA to carbon steel, and the corrosion inhibition rate can reach 96.2% with a long-term effect. Therefore, the compound has a good deoxygenation and corrosion inhibition performance, which has broad application prospects in the field of deoxygenation of industrial water and corrosion protection of industrial carbon steel equipment.

Key words: copper-ammonia complex, diethylhydroxylamine (DEHA), deoxygenation, corrosion inhibition

CLC Number:

TG172.5

WEI Xiaojing, ZHAI Shuangling, SHI Xin, GAO Duolong, WEN Xiaohu, LIU Dongmei, REN Tianhui. Effect of Copper-Ammonia Complex on the Oxygen Removal and Corrosion Inhibition Performance of Diethylhydroxylamine[J]. Journal of Shanghai Jiao Tong University, 2022, 56(6): 818-826.

Figures/Tables 11

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缓蚀剂	m₀/g	m/g	腐蚀速率/ (mm·a^-1)	缓蚀率/ %
空白组	19.8036	19.0346	0.1275
70 mg/L DEHA	20.2326	19.8336	0.0662	48.1
70 mg/L DEHA+ 8 mg/L 铜氨络合物	20.1442	20.1152	0.0048	96.2

缓蚀剂	腐蚀电压/V	腐蚀电流密度/ ( A∙cm^-2)
空白组	-0.5431	7.725×10^-7
70 mg/L DEHA	-0.3342	5.021×10^-7
70 mg/LDEHA+ 8 mg/L 铜氨络合物	-0.2703	8.890×10^-8