采用电化学电解池和测量探针测量了某电厂锅炉柠檬酸酸洗和过氧化氢钝化过程中的极化电阻和腐蚀电位,研究了工业锅炉酸洗过程中腐蚀速度和电位的变化规律.研究表明:应用电化学测量技术分别测量锅炉酸洗过程中酸洗和钝化阶段测量电极的极化电阻和腐蚀电位,可以有效控制酸洗过程中基体金属的腐蚀速率和钝化效果.酸洗过程中,漂洗时的腐蚀速率是酸洗时的10倍左右,漂洗液中一定要加人适量的缓蚀剂,以免引起锅炉基体金属的腐蚀损失.应用腐蚀在线监测技术可以有效控制过氧化氢钝化过程,促进了这种绿色环保型钝化剂在锅炉酸洗中的应用.%Electrochemical cell and measurement probe were employed to measure the polarization resistance and corrosion potential in the process of acid cleaning with citric acid and passivation with hydrogen peroxide(H2O2)for a power plant .Change rule of corrosion rate and potential in the process of boiler cleaning was studied .The study indieates that the corrosion rate and passivation effect can be concrolled effectively by measuring polarization resistance and corrosion potential with electrochemical technology .Corrosion rate in the process of water rinse in about ten times of that in the process of acid cleaning .Hence inhibitor must be added into the water rinse solution to avoid the metal corrosion loss of boiler.Because the process of H2O2 passivation can be monitored by on-line corrosion measurement ,the application of green H2O2 passivator was promoted in the acid cleaning of boiler.
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