AC-HVAF热喷涂非晶和金属陶瓷涂层在压裂液中的冲蚀行为  

Erosion-Corrosion Mechanism of AC-HVAF Sprayed Amorphous and Cermet Coatings in Hydraulic Fracturing Fluid

作　　者：孙丽丽[1,2] 王尊策 王勇[1,2] 

机构地区：[1]东北石油大学机械科学与工程学院,黑龙江大庆163318 [2]黑龙江省石油石化多相介质处理及污染防治重点实验室,黑龙江大庆163318

出　　处：《中国表面工程》2018年第1期131-139,共9页China Surface Engineering

基　　金：国家自然科学基金(51401051);黑龙江省博士后科研启动金(LBH-Q16036)~~

摘　　要：采用喷射冲蚀与电化学测试相结合方法,对AC-HVAF热喷涂非晶金属和金属陶瓷两种涂层在压裂工况下的冲蚀规律进行了研究,评价了腐蚀和冲蚀的交互作用,分析了耐蚀性和硬度在冲蚀时的主导作用,确定了冲蚀机理。结果表明,硬度决定材料的抗冲蚀性能,硬度高的WC涂层表现出更高的抗冲蚀能力。冲蚀过程中,纯机械冲刷引起的失重占主导作用。交互作用中,涂层由腐蚀引起的增量占比例则较高,提高涂层耐蚀性可以减少交互作用失重,进而提高其抗冲蚀性能。AC-HVAF涂层表面则呈现出脆性冲蚀特征,冲蚀时侧重于固体砂粒对表面的碰撞和切削剥蚀作用。涂层孔隙的降低和粘结相结合强度的提高是提高其在压裂液中抗冲蚀性能的关键。The erosion-corrosion rules and synergistic mechanism of the AC-HVAF sprayed Fe-based amorphous metallic and WC-10Co-4Cr cermet coatings in hydraulic fracturing fluid were studied by jet impingement and electrochemical testing methods. The leading role of the corrosion resistance and hardness during the erosion-corrosion was determined. The results show that the hardness of materials has a significant impact on the erosion-corrosion behavior of the coatings, and the WC coating with higher hardness exhibits high erosion-corrosion resistance. The interactions of erosion and corrosion are determined, and the dominant role of the coatings is the damage caused by mechanical factors. The damage caused by corrosion factors forms a large proportion of the coatings. Improving the corrosion resistance of the coating can reduce the loss of interaction, and then improve the erosion resistance. The coatings exhibit brittle erosion process, and mainly reflect in the crash and cutting erosion of the hard particles. The decrease of the porosity and increase of the combining bonding strength are the key factor to increase the erosion-corrosion resistance of the AC-HVAF coatings in fracturing fluid.

关 键 词：AC—HVAF 非晶涂层 陶瓷涂层 压裂液 冲蚀 交互 

分 类 号：TG174.442[金属学及工艺—金属表面处理]