船用继动器壳体材料的腐蚀性能分析

Corrosion Characteristic Analysis of Valve Body Materials for Relay in Ship

用电化学测试手段分别测定了 2 0钢、2Cr1 3、QAl9 2、QAl 1 0 3 1 .5和QAl1 0 4 4等 5种材料在NaCl溶液中的腐蚀电位及与QAl9 2偶接时的电偶腐蚀电流的变化 ,并对测试后各试样的腐蚀状态进行了观察。结果表明 ,铝青铜材料的抗腐蚀性比钢好。其中QAl 1 0 4 4的腐蚀电位最为偏正 ,但它与QAl9 2配副会对QAl 9 2产生较大的阳极电偶腐蚀 ;QAl9 2和QAl 1 0 3 1 .5材料与QAl 9 2配副均有较好的耐电偶腐蚀性能。

Corrosion potentials of 20 steel, 2Cr13, QAl 9 2, QAl 10 3 1.5 and QAl 10 4 4 in NaCl solution, and their galvanic corrosion currents when coupled to QAl 9 2 were tested by electrochemical methods. The surface morphologies of corrosion specimens were examined after the test. The results reveal that the anti corrosion properties of bronze alloys are better than that of steel. QAl 10 4 4 has the most positive corrosion potential among the bronze alloys which will result in a greater galvanic corrosion to anode QAl 9 2 when they coupled. Both QAl 9 2 and QAl 10 3 1.5 show good anti galvanic corrosion property when they coupled with QAl 9 2. The results provide a guideline for the selection of the relay valve material.