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用Ⅰ型缺口试样研究丁黄铜在含5 g/l cucl_2的1 N NH_4OH 水溶液中应力腐蚀时应力分量的作用。由门槛值的测量、交变载荷的作用、室温蠕变的影响、断裂过程的金相观察及断口形貌等结果,可以确认;黄铜不论是在氨水中应力腐蚀或腐蚀疲劳,还是在空气中疲劳,裂纹都从Ⅱ型缺口试样的最大正应力处(0=-110°)萌生,并沿该处的最大剪应力方向(α=-35°))扩展。这表明,正应力在这种应力腐蚀体系中起主导作用,这和正应力能促进阳极溶解过程有关。
The effect of stress component on the corrosion of butadiene brass in 1 N NH_4OH aqueous solution containing 5 g / l cucl_2 was studied by using Ⅰ type notched specimens. It can be confirmed by the measurement of the threshold value, the effect of alternating load, the influence of creep at room temperature, the metallographic observation of the fracture process and the appearance of the fracture surface. Brass can be confirmed whether it is stress corrosion or corrosion fatigue in ammonia water or air The fatigue and cracks all originated from the maximum normal stress (0 = -110 °) of Type II notched specimens and extended along the direction of maximum shear stress (α = -35 °). This shows that normal stress plays a leading role in this stress corrosion system, which is related to the fact that normal stress can promote the anodic dissolution process.