给水管道腐蚀特性与防护措施研究
Research on Corrosion Characteristics and Protective Measures of Water Supply Pipes
闫岩1
作者信息
- 1. 京建滇建设发展(云南)有限公司,云南 昆明 650000
- 折叠
摘要
研究了磺胺二嘧啶与吡咪硫胺(SP)对给水管道的缓蚀特性,在无氧条件下进行了评估,并与工业缓蚀剂(SI)的缓蚀性能进行了比较.结果表明:SP和SI的缓蚀效率相当,SP的最高抑制效率为78.85%,而SI在 0.01 mol·L-1 浓度下的抑制率为 75.44%.SP的缓蚀效率略高,而SI提供了更稳定的防腐蚀保护.随着2 种物质浓度的增加,缓蚀效率也增加,腐蚀速率常数K随着SP和SI浓度的增加而减小,而材料半衰期随着SP和SI浓度的增加而增加.极化曲线显示,SP和SI均表现出混合缓蚀行为.对于SP和SI在管道钢表面吸附的化学吸附机制进行了解释,采用朗缪尔吸附等温线拟合了缓蚀剂的吸附特性.
Abstract
The corrosion inhibition properties of sulfadiazine dipyrimidine and pimelthiamine(SP)on water supply pipes were studied and evaluated under anaerobic conditions and compared with the corrosion inhibition properties of industrial corrosion inhibitors(SI).Modified gravimetric and electrochemical techniques were employed.The experimental results showed that the corrosion inhibition efficiencies of SP and SI were comparable,with a maximum inhibition efficiency of 78.85%for SP and 75.44%for SI at an inhibitor concentration of 0.01 mol·L-1.The corrosion inhibition efficiencies of SP were slightly higher,whereas SI provided a more stable protection against corrosion.The corrosion inhibition efficiency increased as the concentration of both substances increased,the corrosion rate constant K decreased with increasing of SP and SI concentrations,while the material half-life increased with increasing of SP and SI concentrations.The polarization curves showed that both SP and SI exhibited mixed corrosion inhibition behavior.The chemisorption mechanism of SP and SI adsorption on the surface of pipeline steel was explained,and Langmuir adsorption isotherm was used to fit the adsorption characteristics of the corrosion inhibitors.
关键词
给水管道/防腐/缓蚀剂/电化学Key words
Water supply pipe/Corrosion protection/Corrosion inhibitor/Electrochemical引用本文复制引用
基金项目
四川省科技计划(2022YESX0033)
出版年
2024
NETL
NSTL
万方数据