冷喷涂对7050铝合金FSW接头耐应力腐蚀性能的影响
Effect of Cold Spraying on Stress Corrosion Resistance of 7050 Aluminum Alloy FSW Joints
邓呈敏 1张华 1程东海 1盖晓东 2王非凡3
作者信息
- 1. 北京石油化工学院 机械工程学院,北京 102617
- 2. 厦门市特种设备检验检测院,福建 厦门 361004
- 3. 宇航工程研究所,北京 100076
- 折叠
摘要
采用冷喷涂技术在7050铝合金搅拌摩擦焊(FSW)接头表面进行纯Al涂层的制备,研究冷喷涂对FSW接头耐应力腐蚀性能的改善作用,并对其改善因素进行探索.结果表明,冷喷涂后的FSW接头的耐应力腐蚀性能有明显的提高,应力腐蚀断裂时间从24h内延长至480 h以上,断裂位置也从前进侧热影响区变为焊核区.纯Al涂层沉积厚度约 500 μm,孔隙率较低,仅0.74%,均匀分布于接头上表面,无氧化和粉末粒子堆积现象,可在海水腐蚀环境中为接头提供较好的物理防护作用,有效改善接头的应力腐蚀敏感性及腐蚀环境对应力腐蚀的促进作用.冷喷涂层对接头产生压应力,可显著降低接头的残余拉应力,减少内外拉应力的交互作用,延缓应力腐蚀开裂速度.
Abstract
The cold spraying technology was used to prepare pure Al coating on the upper surface of 7050 aluminum alloy friction stir welding(FSW)joint.The effect of cold spraying on the improvement of the stress corrosion resistance of FSW joints was studied,and the improvement factors were explored.The results show that the stress corrosion resistance of cold sprayed FSW joints has been significantly improved,the stress corrosion fracture time has been extended from 24 h to more than 480 h,and the fracture location changes from the heat-affected zone on the advance side to the weld nugget zone.The pure Al coating has a deposition thickness of about 500 μm and a low porosity of only 0.74%.It is evenly distributed on the upper surface of the joint without oxidation and powder particle accumulation.It can provide better physical protection for the joint in a seawater corrosive environment,which can effective improve the stress corrosion sensitivity of joints and the promotion of stress corrosion by the corrosive environment.The cold spray coating produces compressive stress on the joint,which can significantly reduce the residual tensile stress of the joint,reduce the interaction of internal and external tensile stress and delay the rate of stress corrosion cracking.
关键词
7050铝合金/搅拌摩擦焊(FSW)/应力腐蚀/纯Al涂层/残余拉应力Key words
7050 alumium alloy/friction stir welding(FSW)/stress corrosion/pure Al coating/residual tensile stress引用本文复制引用
基金项目
国家自然科学基金(51774047)
北京石油化工学院重要科研成果培育项目(BIPTACF-009)
出版年
2024
NETL
NSTL
万方数据