陈伟,胡素影,向林,高旭,陶健全,陈永君,孙际鹏,解志文.高低温交替海洋环境Ti6Al4V合金的腐蚀损伤机理[J].表面技术,2023,52(8):237-246.
CHEN Wei,HU Su-ying,XIANG Lin,GAO Xu,TAO Jian-quan,CHEN Yong-jun,SUN Ji-peng,XIE Zhi-wen.Corrosion Damage Mechanism of Ti6Al4V Alloy in Alternating High and Low Temperature Marine Environment[J].Surface Technology,2023,52(8):237-246 |
| 高低温交替海洋环境Ti6Al4V合金的腐蚀损伤机理 |
| Corrosion Damage Mechanism of Ti6Al4V Alloy in Alternating High and Low Temperature Marine Environment |
| 投稿时间：2022-06-23 修订日期：2022-11-24 |
| DOI：10.16490/j.cnki.issn.1001-3660.2023.08.018 |
| 中文关键词: Ti6Al4V合金 海洋环境 高温氧化 高温氧化-盐雾交替 高温氧化-浸泡交替 腐蚀损伤机理 |
| 英文关键词:Ti6Al4V alloy marine environment high temperature oxidation alternating high temperature oxidation-salt spray alternating high temperature oxidation-immersion corrosion damage mechanisms |
| 基金项目:西南技术工程研究所合作基金(HDHDW5902020103) |
|
|
| Author | Institution |
| CHEN Wei | University of Science and Technology Liaoning, Liaoning Anshan 114051, China |
| HU Su-ying | University of Science and Technology Liaoning, Liaoning Anshan 114051, China |
| XIANG Lin | Southwest Institute of Technology and Engineering, Chongqing 400039, China |
| GAO Xu | University of Science and Technology Liaoning, Liaoning Anshan 114051, China |
| TAO Jian-quan | Southwest Institute of Technology and Engineering, Chongqing 400039, China |
| CHEN Yong-jun | University of Science and Technology Liaoning, Liaoning Anshan 114051, China |
| SUN Ji-peng | Southwest Institute of Technology and Engineering, Chongqing 400039, China |
| XIE Zhi-wen | University of Science and Technology Liaoning, Liaoning Anshan 114051, China |
|
| 摘要点击次数: |
| 全文下载次数: |
| 中文摘要: |
| 目的 探究高低温交替海洋服役环境中Ti6Al4V合金的腐蚀损伤失效过程，揭示高温氧化、沉积盐膜、频繁启动工作模式耦合作用下合金的腐蚀损伤与退化机理。方法 采用高温氧化、高温氧化-盐雾交替和高温氧化-海水浸泡交替试验方法，对Ti6Al4V合金腐蚀失效行为进行了全面评估;利用X-射线衍射仪(XRD)、X-射线光电子能谱仪(XPS)与扫描电子显微镜(SEM)等微尺度检测分析仪器，全面解析了合金损伤失效过程中表面物相结构、腐蚀产物成分及表/截面形貌特征。结果 650 ℃氧化400 h后，Ti6Al4V合金表面氧化层(TiO2+Al2O3)生长致密且均匀;经50循环高温氧化-盐雾交替试验后，Ti6Al4V合金遭受加速腐蚀损伤，表面存在明显点蚀，氧化层出现分层剥落;经50循环高温氧化-海水浸泡试验后，Ti6Al4V合金腐蚀损伤进一步加速，但氧化层生长迅速，整体增重达5.167 mg/cm2。结论 高温氧化过程中Ti6Al4V合金表面氧化层呈缓慢均匀生长特征，具有优良的抗氧化性。高低温交替工作模式加速了氧化膜快速生长与结构破坏，Cl‒的浓度对Ti6Al4V合金表面氧化层的降解具有显著驱动作用，且Cl‒浓度越高腐蚀降解越严重。随着样品表面氧化层的致密性和完整性被破坏，混合盐逐渐侵入氧化层内部，加剧了氯化物的挥发，表明Ti6Al4V合金在高低温交替环境下抗腐蚀性较差。 |
| 英文摘要: |
| The frequent alternating high and low temperature service pattern of aero engines in the marine environment is an important factor that reduces their service life. The work aims to investigate the corrosion damage failure process of Ti6Al4V alloy in alternating high and low temperature marine service environment and reveal in detail the corrosion damage and degradation mechanisms of the alloy under the synergistic effects of high temperature oxidation, deposited salt films and frequent start-up operating modes. High temperature oxidation, alternating high temperature oxidation-salt spray and alternating high temperature oxidation-seawater immersion tests were employed to evaluate the corrosion behaviors of Ti6Al4V alloy. The phase composition of the test sample surface was characterized by X-ray diffractometry (XRD). The microstructure and local elemental distribution of the test samples were characterized by scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS). Corrosion product composition and compound valence were characterized by X-ray photoelectron spectroscopy (XPS). An in-suit dense and uniform (TiO2+Al2O3) oxide layer was formed on the surface of Ti6Al4V alloy after oxidation at 650 ℃ for 400 h. The rate of sample weight gain gradually decreased over time during the test and was only 2.657 mg/cm2 at the end of the test. Ti6Al4V alloy showed significant cracking and peeling on the surface of the sample after 50 cycles of alternating high temperature oxidation and salt spray test. Severe corrosion damage occurred on the alloy surface caused by the transformation of the liquid salt film in the salt spray environment into a solid salt film adhered to the sample surface in the high temperature environment, which resulted in the laminar separation of the oxide layer. Corrosion damage to the Ti6Al4V alloy was further accelerated during 50 cycles of high temperature oxidation-seawater immersion test, reflected by a rapid growth of the oxide film and an aggravated delamination failure. Although corrosion product shedding was more severe in the high temperature oxidation - seawater immersion environment, the sample was in a constant state of weight gain throughout the test, with a final weight gain up to 5.167 mg/cm2. The test results indicated that the oxide layer on the Ti6Al4V alloy showed a slow and uniform growth trend during the high temperature oxidation process, indicating that the Ti6Al4V alloy had excellent oxidation resistance in the 650 ℃ environment, but experienced a rapid growth and structural damage during the alternating high and low temperature working mode. As a very strong depassivating agent, Cl‒ not only affected the formation of passivation films on the surface of the sample, but also significantly affected the corrosion rate and the degree of corrosion of the metal. A higher concentration of Cl‒ resulted in a more severe degradation damage. In addition, the solid salt film exacerbated the cracking of the oxide layer on the surface of the alloy, which provided a channel for the infiltration of Cl‒. As the denseness and integrity of the oxide layer on the surface of the sample are destroyed, the mixed salt gradually invades the interior of the oxide layer and intensifies the volatilisation of the chloride, which indicates the poor corrosion resistance of the Ti6Al4V alloy in alternating high and low temperature environment. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
渝公网安备 50010702501715号