钛合金表面碱洗及水洗留痕形成机制与腐蚀过程控制  

Formation Mechanism of Residue Water Stains on TC4 Ti-alloy Surface and Conter-measures

作　　者：李晗晔 张志超 王群昌 古岩 陈泽浩 杨莎莎 梅飞强 LI Hanye;ZHANG Zhichao;WANG Qunchang;GU Yan;CHEN Zehao;YANG Shasha;MEI Feiqiang(AECC Shenyang Liming Aeroengine Corporation Limited Technology Center,Shenyang 110043,China;Corrosion and Protection Center,Northeastern University,Shenyang 110819,China)

机构地区：[1]中国航发沈阳黎明航空发动有限责任公司技术中心,沈阳110043 [2]东北大学腐蚀与防护中心,沈阳110819

出　　处：《中国腐蚀与防护学报》2025年第1期244-248,共5页Journal of Chinese Society For Corrosion and Protection

基　　金：教育部中央高效基本科研业务费(N2302007)。

摘　　要：航空发动机用TC4合金在碱洗及随后的高温水洗步骤清洗积碳后,表面出现大量水洗痕迹,从而对后续荧光分析产生严重影响。本研究以TC4合金为实验对象,通过分析TC4合金在10%(质量分数)NaOH溶液中的电化学腐蚀行为分析TC4合金碱洗出现留痕的机制。实验结果表明随碱洗温度升高,TC4合金的腐蚀速率加快。显微观察及能谱分析表明,水洗痕迹源于材料自身的钝化膜由于残留碱液浓度升高而发生腐蚀。去离子水与自来水清洗对比实验说明,随温度升高,试片均出现水洗痕迹,但采用去离子水清洗,可有效避免水洗留痕的产生。It is often noted that there exist a number of residue water-stains on the alloy surface after removing carbon deposits on TC4 Ti-alloy surface by alkaline-washing and subsequent high-temperature water-washing,which can seriously interfere the subsequent fluorescence analysis.Herein,the electroChemical corrosion behavior of TC4 alloy in 10%(mass fraction)NaOH solution at various temperatures is assessed via electroChemical workstation,optical microscopy and SEM+EDS,aiming in understanding the formation mechanism of the residue water stains during the removal proCess of carbon deposits.The results show that with the increasing alkaline solution temperature,the corrosion rate of TC4 alloy accelerates.Results of OM and SEM+EDS characterization show that the emerge of residue water-stains may be closely originated from spots where the existing passivation film was corroded by the concentrated residue alkaline solutions on the alloy surface.Furthermore,after being cleaned with alkali solution of the test parts of the alloy,then they are comparatively cleaned with deionized water and tap water respectively.It shows that with the increase of water temperature,the residue water-stains can be clearly observed on the surface of the test parts.Fortunately,the utilization of deionized water instead of tap water can effectively avoid the oCcurrence of the residue water-stains.

关 键 词：航空发动机 水洗痕迹 腐蚀防护 钛合金 

分 类 号：TG172[金属学及工艺—金属表面处理]