Effect of Prestrain on Intergranular Corrosion of Inconel 600 Alloy in H2SO4-NaCl Solution
Effect of Prestrain on Intergranular Corrosion of Inconel 600 Alloy in H2SO4-NaCl Solution
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预应变对Inconel 600合金在H2SO4-NaCl溶液中晶间腐蚀的影响
DOI：
10.3323/jcorr1991.50.577
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
Takao Sakazume
中科院分区：
文献类型：
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作者：
H. Kamide;Takao Sakazume
研究了预应变对晶间腐蚀的影响，推断了敏化Inconel 600合金在H2SO4-NaCl溶液中晶界优先溶解与晶格缺陷之间的关系。极化曲线显示，抑制降低了无源电流密度，并将无源起始电位（Etps）移至低极性侧。在Etps+51mV下，晶间腐蚀速率随预应变的增加而降低。在980mV下，当预应变值达到10%时，这些值有所下降，但随着预应变的增加，这些值呈上升趋势。无应力条件下的晶间腐蚀速率与预应变之间的关系同样适用于0%预应变条件下的90%防应力恒定载荷。但由于在晶间腐蚀尖端处引入了连续的塑性变形，每个预应变试样在90%抗应力作用下的晶间腐蚀速率随着预应变的增加而增加。EPR值随预应变的增加而增加。极化曲线测量表明，敏化试样呈现晶间腐蚀，30%固溶退火条件下的预应变试样呈现局部腐蚀。因此，认为预应变加速了活性区的晶间腐蚀。结果表明，预应变在活性区加速晶间腐蚀，而在反被动区抑制晶间腐蚀。
The effect of prestrain on intergranular corrosion was studied to infer the relationship between the preferential dissolution of grain boundary and lattice defects of sensitized Inconel 600 alloy in H2SO4-NaCl solution. The polarization curves showed that prestraining decreased passive current densities and shifted starting potentials of trans-passivity (Etps) to less noble side. The intergranular corrosion rates at Etps+51mV decreased with increasing prestrain. Those values at 980mV decreased up to the prestrain of 10% but showed a tendency to increase with higher prestrain. This relationship between the intergranular corrosion rates and prestrain found under no stress also stood under the constant load of 90% proof stress for 0% prestrained specimen. But the intergranular corrosion rates under the applied stress of 90% proof stress for each prestrained specimen increased with increasing prestrain because of the introduction of continuous plastic deformation at intergranular corrosion tips. EPR values increased with increasing prestrain. After measurements of polarization curves, sensitized specimens showed intergranular corrosion and 30% prestrained specimen of solution annealed condition showed localized one as well. Therefore, it is thought that the intergranular corrosion in an active region is accelerated by prestrain. It is concluded that prestraining accelerated the intergranular corrosion in an active region but suppressed it in a trans-passive one.