摘要
为研究铝硅聚苯酯(AlSi-PHB)可磨耗封严涂层在海洋环境下的腐蚀行为及腐蚀对涂层性能的影响,在TC4基体上利用等离子喷涂技术制备AlSi-PHB涂层可磨耗封严涂层,利用扫描电子显微镜(SEM)、X射线衍射(XRD)等测试方法,开展192 h酸性盐雾试验、硬度试验、结合强度试验,对涂层腐蚀前后的腐蚀形貌及腐蚀机理、涂层结合强度和硬度的变化进行研究。结果表明,经酸性盐雾试验后,涂层表面结构被完全破坏,涂层内部出现了较大的横向裂纹及腐蚀区域,主要腐蚀产物为Al(OH)_(3)。涂层内部孔隙的存在为腐蚀行为发生提供了场所,腐蚀介质Cl-通过孔隙侵入到涂层的内部,在“闭塞电池”的作用下,涂层内部发生更加剧烈的腐蚀。腐蚀前后,涂层的平均硬度从(65.2±10.7)HR15Y下降到(59.6±8.5)HR15Y,平均结合强度从(11.3±1.1)MPa下降到(1.7±0.6)MPa,对涂层服役可靠性产生了影响。
In order to study the corrosion behavior of AlSi-PHB sealing coatings in marine environment and the effect of corrosion on coating properties,the AlSi-PHB sealing coating was prepared on TC4 matrix by plasma spraying technology.The 192 h acid salt spray test,hardness test and bond strength test were carried out.Using scanning electron microscopy(SEM),X-ray diffraction(XRD)and other testing methods to study the corrosion morphology,corrosion mechanism,coating bond strength and hardness changes before and after corrosion.The results show that after 192 h acid salt spray test,the surface structure of the coating is completely destroyed,and large transverse cracks and corrosion areas appear inside the coating,and the main corrosion product is Al(OH)_(3).The existence of pores inside the coating provides a place for corrosion.The corrosive medium Cl-invades into the interior of the coating through the pores,and more intense corrosion occurs in the deep layer of the coating under the action of“blocked battery”.Before and after corrosion,the average hardness of the coating drops from(65.2±10.7)HR15Y to(59.6±8.5)HR15Y,and the average bonding strength drops from(11.3±1.1)MPa to(1.7±0.6)MPa,which could not meet the service requirements.
作者
李姝
周凯旋
刘振
王静
钟燕
朱昌洪
房永超
田浩亮
LI Shu;ZHOU Kaixuan;LIU Zheng;WANG Jing;ZHONG Yan;ZHU Changhong;FANG Yongchao;TIAN Haoliang(AECC Sichuan Gas Turbine Establishment,Chengdu 610500,China;Harbin Engineerring University,Harbin 150001;Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material,AECC Beijing Institution of Aeronautical Materials,Beijing 100095,China)
出处
《热喷涂技术》
2024年第2期20-27,共8页
Thermal Spray Technology
基金
国家重点研发计划项目(2023YFB0200100)
国家自然科学基金资助项目(52075508,52305224)
中国航空发动机集团科技创新平台项目(CXPT-2023-028)。
关键词
酸性盐雾
硬度
结合强度
封严涂层
腐蚀形貌
acid salt spray
hardness
bonding strength
sealing coating
corrosion morphology