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采用超声冲击技术对Q370qE桥梁钢焊接接头进行了全覆盖超声冲击处理(Ultrasonic Impact Treatment,UIT),用金相显微镜、环境扫描电子显微镜及NaCl溶液浸泡试验对Q370qE焊接接头在大气中的耐蚀性能、UIT对腐蚀接头表面的修复作用及焊接接头UIT前后的耐NaCl溶液腐蚀性能进行了测试和分析。结果表明,Q370qE钢焊接接头在室内放置6个月后,其表面呈均匀腐蚀+点状腐蚀特征,且剖面呈深度达0.3 mm的根须状腐蚀裂纹;该腐蚀接头经过UIT后,其表面锈层及裂纹已基本被去除干净,露出了较亮的金属色,仅余下少量较浅的点状腐蚀坑;从腐蚀溶液浸泡试验结果来看,Q370qE焊接接头经过UIT后,由于次表层形成了约平行于焊缝表面的非常细密的纤维状形变组织及较大的残余压应力,使其抗NaCl溶液腐蚀性能得到明显提高。
The ultrasonic impact treatment (UIT) of Q370qE steel welded joints was carried out by using ultrasonic impact technique. The corrosion resistance of Q370qE welded joints in the atmosphere was observed by metallographic microscope, environmental scanning electron microscope and NaCl solution immersion test , UIT test and analysis of the repair of the corrosion joint surface and corrosion resistance of NaCl solution before and after the UIT welded joints. The results show that the surface of the Q370qE steel welded joint is uniformly corroded and pitting corrosion after 6 months of indoor application, and the cross-section is a root-shaped corrosion crack with a depth of 0.3 mm. After the corroded joint passes through UIT, its surface rust Layer and cracks have been basically removed, exposing a bright metallic color, leaving only a small amount of shallow pits corrosion pit corrosion; immersion test results from the point of view, Q370qE welded joints through the UIT, due to the formation of subsurface about Parallel to the weld surface of the very fine fibrous deformation of the organization and a large residual compressive stress, so that the corrosion resistance of NaCl solution has been significantly improved.