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以北方重工业城市—抚顺望花区的雪水为腐蚀溶液,以3.5%NaCl溶液为对比介质,通过动电位极化曲线考察了雪水对20号钢的腐蚀性,结果表明,雪水的腐蚀性与3.5%NaCl溶液相接近。通过动电位极化、交流阻抗和实验室浸泡等方法考察了Ni-Cu-P化学镀层和氯化铈对20号钢在雪水中的腐蚀防护的可行性。结果表明:与20号钢相比,均匀致密的Ni-Cu-P镀层在雪水中能够形成钝化膜,雪水中加入氯化铈以后,氯化铈在金属表面能够形成沉淀膜。钝化膜和沉淀膜能够阻碍O2的传输,隔离与腐蚀介质的直接接触,从而表现出更低的自腐蚀电流密度和更大的电荷转移电阻,腐蚀速度因而下降。因此,Ni-Cu-P化学镀层和氯化铈都可分别用作碳钢材料在重工业污染大气环境中的腐蚀防护涂层或缓蚀剂。
Taking snow water in Wanghua Fushun, a heavy industrial city in the north, as the corrosion solution and 3.5% NaCl solution as the contrast medium, the corrosiveness of snow water to No. 20 steel was investigated by potentiodynamic polarization curve. The results show that the corrosiveness of snow water Close to 3.5% NaCl solution. The feasibility of corrosion protection of No. 20 steel in snow water with Ni-Cu-P electroless plating and cerium chloride was investigated by potentiodynamic polarization, AC impedance and laboratory immersion. The results show that the uniform and dense Ni-Cu-P coating can form a passivation film in snow water compared with that of 20 steel. After the cerium chloride is added to the snow water, cerium chloride can form a precipitate film on the metal surface. Passivation and precipitation films can obstruct O2 transport and isolate direct contact with the corrosive media, thus exhibiting lower self-corrosion current densities and greater charge transfer resistance, resulting in lower corrosion rates. Therefore, Ni-Cu-P electroless plating and cerium chloride can be respectively used as corrosion protection coatings or corrosion inhibitors of carbon steel materials in heavy industry polluted atmosphere.