逆焊接处理对不同材料抗应力腐蚀性能的影响

Influence and Mechanism of Anti-Welding Procedure on Corrosion Resistance of the Different Materials

介绍了采用逆焊接加热处理的方法对Q235、16MnR、20g钢等不同材料在酸性和碱性溶液中抗应力腐蚀性能的影响及机理。将每种材料的试件进行加热处理,再用冷却介质只对焊缝处进行快速冷却,从而获得与焊接温度场相反的负温差,降低焊接过程中产生的残余应力。经过350℃处理后的Q235和16MnR钢,在酸性溶液中的腐蚀速率比未处理时分别降低了66.1%和67.9%。实验结果表明,逆焊接加热处理有效的降低了焊接残余应力,并且减缓了应力腐蚀速率,适用于有防止应力腐蚀要求的焊接结构使用。

It was introduced that the influence and mechanics of anti-welding procedure on corrosion resistance of the different materials such as Q235 steel, 16MnR steel and 20g steel in the acidic and alkali solutions. This method is to carry on the heat treatment for each kind of material sample, and use the cooling medium to cool the welding joint rapidly, in order to obtain the negative temperature departure that is opposite to the welding temperature field, and relieve the residual stresses produced in the welding process. Q235 steel and 16MnR steel which are processed by 350℃ anti-welding procedure, compared with the unprocessed samples, the corrosion rate in the acidic solution reduces 66.1 %and 67.9% respectively. The results show that the anti- welding procedure relieves effectively the welding line residual stresses and slows up the stress corrosion rate. This method can be applied to the welding structures which are required to prevent the stress corrosion.