Corrosion Characteristic Analysis of Valve Body Materials for Relay in Ship
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摘要: 用电化学测试手段分别测定了20钢、2Cr13、QAl9-2、QAl10-3-1.5和QAl10-4-4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QAl10-4-4的腐蚀电位最为偏正,但它与QAl9-2配副会对QAl9-2产生较大的阳极电偶腐蚀;QAl9-2和QAl10-3-1.5材料与QAl9-2配副均有较好的耐电偶腐蚀性能。研究结果对继动器壳体材料的选择具有指导意义。Abstract: 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.
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Key words:
- Electrochemistry /
- Corrosion potential /
- Corrosion current
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