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首页> 外文会议>International Conference on Aluminum Alloys >CORROSION INHIBITION OF STRESS CORROSION CRACKING AND LOCALIZED CORROSION OF TURBO-EXPANDER MATERIALS
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CORROSION INHIBITION OF STRESS CORROSION CRACKING AND LOCALIZED CORROSION OF TURBO-EXPANDER MATERIALS

机译：压力腐蚀裂纹的腐蚀抑制和涡轮扩展器材料的局部腐蚀

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Stress corrosion cracking of 7050 aluminum alloy in the turbo expander and steam/gas turbine industry can cause catastrophic failures, especially for turbo machinery systems performing in hostile, corrosive environments. Commercially available inhibitors were investigated for their effectiveness in reducing and controlling the corrosion susceptibility. Inhibitor effectiveness was confirmed with electrochemical corrosion techniques. Polarization resistance increased with concentration of corrosion inhibitor due to film formation and displacement of water molecules. Cyclic polarization behavior for samples in the 1.0% to 10.0% inhibitor concentration showed a shift in the passive film breakdown potential. The substantial increase in the passive range has positive consequences for neutralizing pitting and crevice corrosion cell chemistry. The strain to failure and tensile strength determined from slow strain rate studies for the aluminum alloy showed pronounced improvement resulting from the inhibitors ability to mitigate SCC. Additionally, the fractographic analysis showed a changed morphology with ductile overload as the primary failure mode instead of transgranular or intergranular cracking.
机译：涡轮增压器和蒸汽/燃气轮机行业中7050铝合金的应力腐蚀裂纹可能导致灾难性故障，特别是对于在敌对，腐蚀性环境中进行的涡轮机械系统。研究市售抑制剂在减少和控制腐蚀易感性方面的有效性。通过电化学腐蚀技术确认抑制剂效果。由于膜形成和水分子的位移，偏振抗性随着腐蚀抑制剂的浓度而增加。 1.0％至10.0％抑制剂浓度的样品中样品的循环偏振行为显示出钝化膜分解电位的偏移。被动范围的大幅增加对中和点和缝隙腐蚀细胞化学具有积极的后果。从铝合金的慢应变速率研究中确定的失效和拉伸强度的菌株显示出由抑制剂减轻SCC的能力产生的显着改善。另外，FROCTORACT分析显示出变化的形态，与韧性过载作为初级故障模式而不是跨晶或晶间裂缝。

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