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| 2219和2195铝合金焊接接头的腐蚀行为差异研究 |
| Difference of Corrosion Behavior between 2219 and 2195 Aluminum Alloy Welded Joints |
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| DOI：10.3969/j.issn.1674-6457.2022.08.016 |
| 中文关键词: 铝合金 搅拌摩擦焊 钨极氩弧焊 腐蚀 |
| 英文关键词: aluminum alloy friction stir welding tungsten inert gas welding corrosion |
| 基金项目:国家自然科学基金(52165049);江西省自然科学基金(20202BABL214031);上海航天科技创新基金(SAST2019–062);航空基金(2020Z048056002) |
| Author Name | Affiliation | | TANG Hua-wei | School of Material Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China
Shanghai Aerospace Equipment Manufacturing, Shanghai 200245, China | | DENG Yun-fa | School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China | | QIAN Shuai-hao | School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China | | ZHANG Ti-ming | School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China | | CHEN Yu-hua | School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China |
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| 中文摘要: |
| 目的 研究运载火箭贮箱用2195新型铝锂合金搅拌摩擦焊接头和熔化焊接头相对于传统的2219铝合金焊接接头耐腐蚀性能的差异，分析耐蚀性的演变规律，为贮箱制造及表面防护提供理论指导。方法 以传统的2219铝合金为对照，采用盐雾腐蚀试验、动电位极化曲线测试等方法系统研究2195铝锂合金焊接接头的腐蚀电位、腐蚀电流密度、腐蚀速率等方面的性能，进而判断新型铝合金材料与传统铝合金材料耐蚀性能的差异。结果 2种铝合金焊接接头各个亚区的耐蚀性均呈现相同的变化规律，其中搅拌摩擦焊接头的耐蚀性能按照热影响区、母材区、热机影响区、焊核区的顺序依次增加;TIG焊接头的耐蚀性能按照热影响区、母材区、焊缝区的顺序依次增加，且在热影响区存在晶间腐蚀的现象。此外，2219和2195铝合金TIG焊接接头热影响区自腐蚀电位分别为−0.653 V和−0.667 V，腐蚀电流密度分别为7.35 mA/cm2和7.55 mA/cm2。结论 2219和2195铝合金搅拌摩擦焊和TIG焊接头的耐蚀性差别不大，且均在热影响区耐蚀性最差;采用同种合金进行焊接时，TIG焊接头的耐蚀性能比FSW接头的差。 |
| 英文摘要: |
| The work aims to study the difference of corrosion resistance between 2195 Al-Li alloy friction stir welded (FSW) joints and fusion welded joints and the traditional 2219 aluminum alloy welded joints, and thus to reveal the evolution law of corrosion resistance and provide theoretical guidance for tank manufacturing and surface protection. The salt spray corrosion test and potentiodynamic polarization curve test were conducted to analyze properties of 2195 Al-Li alloy welded joint in terms of corrosion potential, corrosion current density, corrosion rate, etc. to judge the differences of corrosion resistance between new and traditional aluminum alloys. The results showed that corrosion resistance of two aluminum alloy welded joints had the same change rule. The corrosion resistance of friction stir welded joint increased in the order of heat affected zone (HAZ), base metal (BM), thermo-mechanical affected zone (TMAZ), weld nugget zone (WNZ), while that of TIG welded joint increased in the order of HAZ, BM and weld zone (WZ). The phenomenon of intergranular corrosion existed in HAZ. In addition, the self-corrosion potential of TIG welded joints in 2219 and 2195 aluminum alloys was −0.653 V and −0.667 V, respectively, and the corrosion current density was 7.35 mA/cm2 and 7.55 mA/cm2, respectively. The conclusions illustrate that the corrosion resistance of FSW and TIG welded joints of 2219 and 2195 aluminum alloys was little different, and their corrosion resistance was the worst in HAZ. The corrosion resistance of TIG welded joints was worse than FSW joints in the same aluminum alloy. |
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