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利用α—Ti在甲醇溶液中恒电位腐蚀形成钝化膜前后流变应力之差可直接测量钝化膜引起的平均应力.用X射线光电子能谱(XPS)研究了钝化膜的成分.结果表明,当腐蚀电位V≥-240mV时,钝化膜产生拉应力,且随电位下降,膜致拉应力逐渐下降;当电位V≤-280 mV时,钝化膜引起压应力.α—Ti在甲醇溶液中应力腐蚀(SCC)敏感性随外电位的变化和膜致应力的变化相一致.当膜致应力是压应力时,不发生SCC;随膜致拉应力升高,SCC敏感性也升高.
The average stress caused by the passivation film can be directly measured by the difference of the flow stress before and after forming the passivation film by α-Ti corrosion in methanol solution. The composition of passivation film was studied by X-ray photoelectron spectroscopy (XPS) .Results The results show that the tensile stress of the passivation film is reduced when the corrosion potential V≥-240mV, and the tensile stress of the film decreases gradually with the decrease of the potential. The passivation film induces compressive stress when the potential V≤-280mV. The sensitivity of SCC to methanol solution is consistent with the change of external potential and the change of membrane induced stress. When the membrane induced stress is compressive stress, SCC does not occur. With the increase of membrane induced tensile stress, the sensitivity of SCC increases high.