WC-10Co-4Cr涂层在不同温度酸与NaCl溶液中的耐腐蚀性能
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摘要
为提高1Cr18Ni9Ti不锈钢在NaCl和酸溶液环境中的耐磨损性能,利用等离子喷涂制备两种晶粒WC-10Co-4Cr涂层,研究其在3.5%(质量分数,下同)NaCl溶液与酸溶液(pH=5.0)中的耐腐蚀性能。结果表明:涂层中含有WC,W_2C,W以及η相(Co_xW_xC)。两种涂层在3.5%NaCl溶液中的腐蚀电位均高于1Cr18Ni9Ti基体的腐蚀电位。在不同温度酸溶液(pH=5.0)中,纳米WC-10Co-4Cr涂层的电位差随温度的变化最小。涂层在NaCl和酸溶液中腐蚀机制分别为:WC-10Co-4Cr涂层表面吸附氧粒子与涂层中的Co和WC在3.5%NaCl溶液中形成电偶;在酸溶液中(pH=5.0),涂层中的Co溶解形成Co~(2+)离子,和WC相直接形成电偶腐蚀,导致涂层表面出现孤立的WC颗粒。
In order to improve the wear resistance of 1 Cr18 Ni9 Ti stainless steel in NaCl and acid solution environment, the WC-10 Co-4 Cr coatings with two grain sizes were prepared by plasma spraying, and the corrosion resistance in 3.5%(mass fraction, the same below)NaCl and acid solution(pH=5.0) were investigated. The results show that the WC, W_2C, W and η(Co_xW_xC) exist in these coatings. The corrosion potential of these coatings is higher than that of 1 Cr18 Ni9 Ti substrate in 3.5% NaCl solution. In the acid solution(pH=5.0) at different temperatures, the potential difference for the nanometer WC-10 Co-4 Cr coatings has little change with the temperature. The corrosion mechanism of the coatings in NaCl and acid solution is shown as follows: the oxygen atoms adsorbed on the surface of WC-10 Co-4 Cr coating, can impel the Co and WC to form the galvanic couple in 3.5% NaCl solution. In the acid solution(pH=5.0), Co phase in the WC-10 Co-4 Cr coatings is dissolved to Co~(2+), and formed the galvanic corrosion with WC phase, so the isolated WC particles are formed on the coating surface.
In order to improve the wear resistance of 1 Cr18 Ni9 Ti stainless steel in NaCl and acid solution environment, the WC-10 Co-4 Cr coatings with two grain sizes were prepared by plasma spraying, and the corrosion resistance in 3.5%(mass fraction, the same below)NaCl and acid solution(pH=5.0) were investigated. The results show that the WC, W_2C, W and η(Co_xW_xC) exist in these coatings. The corrosion potential of these coatings is higher than that of 1 Cr18 Ni9 Ti substrate in 3.5% NaCl solution. In the acid solution(pH=5.0) at different temperatures, the potential difference for the nanometer WC-10 Co-4 Cr coatings has little change with the temperature. The corrosion mechanism of the coatings in NaCl and acid solution is shown as follows: the oxygen atoms adsorbed on the surface of WC-10 Co-4 Cr coating, can impel the Co and WC to form the galvanic couple in 3.5% NaCl solution. In the acid solution(pH=5.0), Co phase in the WC-10 Co-4 Cr coatings is dissolved to Co~(2+), and formed the galvanic corrosion with WC phase, so the isolated WC particles are formed on the coating surface.
引文
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[20] 李健,夏建飞.等离子喷涂WC/Co涂层耐中性盐雾腐蚀性能[J].腐蚀科学与防护技术,2014,26(1):35-40.LI J,XIA J F.Salt spray corrosion resistance of WC/Co coating prepared by plasma spraying[J].Corrosion Science and Protec-tion Technology,2014,26(1):35-40.
[2] PUCHI-CABRERA E S,STAIA M H,SANTANA Y Y,et al.Fatigue behavior of AA7075-T6 aluminum alloy coated with a WC-10Co-4Cr cermet by HVOF thermal spray [J].Surface and Coatings Technology,2013,220(15):122-130.
[3] GOYAL D K,SINGH H,KUMAR H,et al.Slurry erosion behavior of HVOF sprayed WC-10Co-4Cr and Al2O3+13TiO2 coatings on a turbine steel [J].Wear,2012,289(15):46-57.
[4] 周克裕,邓春明,刘敏,等.300M钢基体上高速火焰喷涂WC-17Co和WC-10Co-4Cr修复层的疲劳和抗盐雾腐蚀性能[J].稀有金属材料与工程,2009,38(4):671-676.ZHOU K S,DENG C M,LIU M,et al.Characterizations of fatigue and salt spray corrosion resistance of HVAF sprayed WC-17Co and WC-10Co-4Cr coatings on the substrate of 300M steel[J].Rare Metal Materials and Engineering,2009(4):671-676.
[5] SOUZA V A D,NEVILLE A.Corrosion and synergy in a WC-Co-Cr HVOF thermal spray coating-understanding their role in erosion-corrosion degradation [J].Wear,2005,259(1):171-180.
[6] 杨伟华,吴玉萍,洪晟,等.超音速火焰喷涂WC-10Co-4Cr涂层的微观组织与摩擦磨损性能[J].材料工程,2018,46(5):120-125.YANG W H,WU Y P,HONG S,et al.Microstructure,friction and wear properties of HVOF sprayed WC-10Co-4Cr coating[J].Journal of Materials Engineering,2018,46(5):120-125.
[7] 刁望勋,王志雄,高俊国,等.不同工艺粉末对超音速火焰喷涂WC-10Co-4Cr涂层性能的影响[J].航空材料学报,2013,33(3):38-45.DIAO W X,WANG Z X,GAO J G,et al.Influence of different powder on properties of WC10Co4Cr coatings prepared by HVOF[J].Journal of Aeronautical Materials,2013,33(3):38-45.
[8] 陈杰,宋惠,戴宇,等.镁合金表面冷喷涂420不锈钢/WC-17Co涂层及其耐磨耐蚀性能[J].航空材料学报,2018,38(4):82-86.CHEN J,SONG H,DAI Y,et al.Wear and corrosion properties of cold sprayed 420 stainless Steel/WC-17Co coating on magn-esium alloy[J].Journal of Aeronautical Materials,2013,38(4):82-86.
[9] 赵立英,刘平安.氧燃比对爆炸喷涂碳化钨涂层结构和性能的影响[J].材料工程,2016,44(6):50-55.ZHAO L Y,LIU P A.Effects of oxygen-fuel ratio on structure and property of detonation gun sprayed WC coating[J].Journal of Materials Engineering,2016,44(6):50-55.
[10] 王海军,蔡江,韩志海.超音速等离子与HVOF喷涂WC-Co涂层的冲蚀磨损性能研究[J].材料工程,2005(4):50-54.WANG H J,CAI J,HAN Z H.Study on erosion wear of WC-Co coatings prepared by supersonic plasma spray and HVOF spray[J].Journal of Materials Engineering,2005(4):50-54.
[11] 杜三明,靳俊杰,胡传恒,等.特征等离子喷涂参数对WC涂层结构和性能的影响[J].摩擦学学报,2015,35(4):362-367.DU S M,JIN J J,HU C H,et al.Influence of critical parame-ter on microstructure and properties of WC coatings by plasma spraying[J].Tribology,2015,35(4):362-367.
[12] 刘安强,袁建鹏,祝弘滨,等.超音速火焰喷涂WC-10Co4Cr涂层在含Cl-环境中的腐蚀行为[J].热喷涂技术,2016,8(2):16-21.LIU A Q,YUAN J P,ZHU H B,et al.Corrosion behavior of HVOF sprayed WC-10Co4Cr coating in containing Cl- environ-ment[J].Thermal Spray Technology,2016,8(2):16-21.
[13] WANG L J,QIU P X,LIU Y,et al.Corrosion behavior of thermal sprayed WC cermet coatings containing metallic binders in saline environment[J].Transactions of Nonferrous Metal So-ciety China,2013,23:2611-2617
[14] 倪继良,程涛涛,丁坤英,等.WC粒度对WC-10Co-4Cr涂层磨粒磨损性能的影响[J].材料保护,2013,46(1):19-21.NI J L,CHENG T T,DING K Y,et al.Effect of grain size of tungsten carbide particulates on abrasive wear behavior of WC-10Co-4Cr coatings[J].Materials Protection,2013,46(1):19-21.
[15] 龙坚战,杜勇,陆必志,等.Co-Ni-Al复合黏结相硬质合金研究进展[J],航空材料学报,2018,38(5):47-58.LONG J Z,DU Y,LU B Z,et al.Research progress in cem-ented carbide with Co-Ni-Al composite binder phase[J].Journal of Aeronautical Materials,2018,38(5):47-58.
[16] MATEEN A,SAHA G C,KHAN T I.Tribological behavior of HVOF sprayed near-nanostructured and microstructured WC-17wt.%Co coatings[J].Surface & Coatings Technology,2011(206):1077-1084.
[17] PERRY J M,NEVILLE A,WILSON V,et al.Assessment of the corrosion rates and mechanisms of a WC-Co-Cr HVOF coa-ting in static and liquid-solid impingement saline environments[J].Surface & Coatings Technology,2001,137:43-49.
[18] LEKATOU A.Corrosion properties of HVOF cermet coatings with bond coats in an aqueous chloride environment [J].Thin Solid Films,2008,(5):112-115.
[19] 吴迎飞,陈华辉,李海存,等.铁基复合材料中碳化钨颗粒的溶解析出行为[J].材料工程,2018,46(8):98-105.WU Y F,CHEN H H,LI H C,et al.Dissolution and precipitation behavior of WC particles in iron matrix composites[J].Journal of Materials Engineering,2018,46(8):98-105.
[20] 李健,夏建飞.等离子喷涂WC/Co涂层耐中性盐雾腐蚀性能[J].腐蚀科学与防护技术,2014,26(1):35-40.LI J,XIA J F.Salt spray corrosion resistance of WC/Co coating prepared by plasma spraying[J].Corrosion Science and Protec-tion Technology,2014,26(1):35-40.