α—Ti在腐蚀过程中钝化膜引起拉应力的研究  

INVESTIGATION OF TENSILE STRESS GENERATED BY PASSIVE FILM DURING CORROSION PROCESS FOR α-Ti

作　　者：吕宏[1] 高克玮[1] 聂一凡[1] 褚武扬[1] 

机构地区：[1]北京科技大学,北京100083

出　　处：《金属学报》1997年第12期1262-1267,共6页Acta Metallurgica Sinica

摘　　要：本文研究α—Ti在腐蚀过程中钝化膜所产生的内应力的大小。结果表明，一边涂有保护层的α－Ti薄条在0.1mol／LH2SO4溶液中自然腐蚀过程中，随着钝化膜的形成，薄条不断向腐蚀面弯曲（保护面鼓起），即在试样表层产生一个拉应力。这个附加拉应力不断增大，其最大值为（5个试样平均），接近或等于屈服应力。在SCC过程中这个附加应力将和外应力叠加，促进位错发射和运动，从而在低应力（或低KI）下导致SCC裂纹形核。The α-Ti foil with protective layer in one side bended to corrosion surface gradually during corrosion process in 0.1 mol / L H2SO4, while the passive film was formed,i.e. a tensile stress was developed in the surface layer of the sample. The extra tensile stress grew gradually, whose maximum value was 313 MPa (average value of 5 samples),which was near or reached the yield stress. The extra tensile stress would be added to the load stress during SCC to facilitate the emission and motion of dislocation, so that SCC cracks could nucleate in lower stress(or lower KI).

关 键 词：Α-TI 腐蚀 钝化层 拉应力 应力腐蚀 硫酸 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG172.63[金属学及工艺—金属材料]