冷喷涂纯铝涂层耐腐蚀性能研究
|
摘要
目的研究冷喷涂纯铝涂层耐中性盐雾腐蚀性能,为冷喷涂技术在海洋大气防腐环境中的应用提供理论依据。方法采用冷喷涂技术在30Cr Mn Si A钢基体上制备纯铝涂层,利用金相组织分析、XRD衍射分析、电化学测试、中性盐雾试验等技术方法,考察冷喷涂涂层试样的耐腐蚀性能及其影响因素。结果冷喷涂涂层十分致密,随着喷涂温度和压力的不断提高,涂层的致密度不断增加,在喷涂温度为500℃、喷涂压力为1.2 MPa、喷涂距离为25 mm及工作气体为氮气的工艺条件下,纯Al涂层的孔隙率为0.5%,涂层中无氧化物存在,能够有效隔绝腐蚀介质和基体,为基体提供物理腐蚀防护。纯Al涂层的腐蚀速率为4.935×10?7 A/cm2,并作为阳极为基体提供电化学腐蚀防护,中性盐雾试验1440 h后无腐蚀。腐蚀形貌分析表明,在表面钝化膜防护及腐蚀产物的封闭作用下,冷喷涂纯铝涂层具有优异的耐腐蚀性能,虽然发生一定腐蚀,但腐蚀速率较小,表面质量良好,可以作为长效防腐涂层。结论冷喷涂纯铝涂层具有优异的耐腐蚀性能,可以为钢铁材料提供长效效防护。
The work aims to provide theoretical basis for applications of cold spraying technology in marine atmosphere anticorrosion by studying corrosion resistance of cold sprayed pure Al coating to neutral salt spray. Pure Al coating was prepared on 30 Cr Mn Si A substrate by taking advantage of cold spraying technology. The corrosion resistance and the influence factors of cold sprayed coating samples were studied by means of such techniques as metallographic structure analysis, XRD diffraction analysis, electrochemical corrosion test and neutral salt spray test. Cold sprayed coating was very compact, its compactness increased continuously as the spraying temperature and pressure improved. Provided with the process conditions of 500 ℃(spraying temperature), 1.2 MPa(spraying pressure of N_2), 25 mm(spraying distance) and nitrogen as working gas, the porosity of pure Al coating was 0.5 % and no oxide was present in the coating, hence the coating could isolate corrosive medium from substrate effectively. The corrosion rate of pure Al coating was 4.935×10-7 A/cm~2. The coating provided electrochemical corrosion protection for the subsdtrate as anode. The pure Al coating was not subject to corrosion reaction in neutral salt spray test for 1440 h. Corrosion morphology analysis indicated that cold sprayed pure Al coating showed excellent corrosion resistance under the protection of surface passivation film and sealing process of corrosion products. Though slight corrosion occurred, the corrosion rate was low and surface quality was good, the cold sprayed Al coating could be a long-acting anticorrosive coating. Cold sprayed pure Al coating shows excellent corrosion resistance and can provide a long-acting effective corrosion protection for steels.
The work aims to provide theoretical basis for applications of cold spraying technology in marine atmosphere anticorrosion by studying corrosion resistance of cold sprayed pure Al coating to neutral salt spray. Pure Al coating was prepared on 30 Cr Mn Si A substrate by taking advantage of cold spraying technology. The corrosion resistance and the influence factors of cold sprayed coating samples were studied by means of such techniques as metallographic structure analysis, XRD diffraction analysis, electrochemical corrosion test and neutral salt spray test. Cold sprayed coating was very compact, its compactness increased continuously as the spraying temperature and pressure improved. Provided with the process conditions of 500 ℃(spraying temperature), 1.2 MPa(spraying pressure of N_2), 25 mm(spraying distance) and nitrogen as working gas, the porosity of pure Al coating was 0.5 % and no oxide was present in the coating, hence the coating could isolate corrosive medium from substrate effectively. The corrosion rate of pure Al coating was 4.935×10-7 A/cm~2. The coating provided electrochemical corrosion protection for the subsdtrate as anode. The pure Al coating was not subject to corrosion reaction in neutral salt spray test for 1440 h. Corrosion morphology analysis indicated that cold sprayed pure Al coating showed excellent corrosion resistance under the protection of surface passivation film and sealing process of corrosion products. Though slight corrosion occurred, the corrosion rate was low and surface quality was good, the cold sprayed Al coating could be a long-acting anticorrosive coating. Cold sprayed pure Al coating shows excellent corrosion resistance and can provide a long-acting effective corrosion protection for steels.
引文
[1]侯保荣.海洋钢结构浪花飞溅区腐蚀控制技术[M].北京:科学出版社,2011:5—6.HOU Bao-rong.Corrosion Control Technology of Marine Steel Structure in Spoondrift Area[M].Beijing:Science Press,2011:5—6.
[2]石仲川,张晓云,陈昊,等.高强钢冷喷涂铝锌复合涂层性能研究[J].材料工程,2015,43(2):14—19.SHI Zhong-chuan,ZHANG Xiao-yun,CHEN Hao,et al.Properties of Cold Spray Al/Zn Coatings on Highstrength Steel[J].Journal of Materials Engineering,2015,43(2):14—19.
[3]苏贤涌,周香林,崔华,等.冷喷涂技术的研究进展[J].表面技术,2007,36,(5):71—74.SU Xian-yong,ZHOU Xiang-lin,CUI Hua,et al.Research Progress in Cold Gas Dynamic Spray Technology[J].Surface Technology,2007,36,(5):71—74.
[4]李长久.中国冷喷涂研究进展[J].中国表面工程,2009,22(4):6—14.LI Chang-jiu.Developments of Cold Spray in China[J].China Surface Engineering,2009,22(4):6-14.
[5]李文亚,余敏.冷喷涂技术的最新研究现状[J].表面技术,2010,39(5):95—102.LI Wen-ya,YU Min.Latest Development of Cold Spray Technology[J].Surface Technology,2010,39(5):95—102.
[6]曹京宜,张寒露,张锋,等.不同防污涂层下5083铝合金的海水腐蚀性能研究[J].装备环境工程,2016,13(4):28—34.CAO Jing-yi,ZHANG Han-lu,ZHANG Feng,et al.Seawater Corrosion Performances of 5083 Aluminum Alloy under Antifouling Coating Systems[J].Equipment Environmental Engineering,2016,13(4):28—34.
[7]钟厉,王昭银,张华东.冷喷涂沉积机理极其装备的研究进展[J].表面技术,2015,44(4):15—22.ZHONG Li,WANG Zhao-yin,ZHANG Hua-dong.Research Progress of Precipitation Mechanism and Apparatus of Cold Spray[J].Surface Technology,2015,44(4):15—22.
[8]郑建新,郝婉君.真空度对真空冷喷涂气固两相流的影响[J].表面技术,2015,44(12):75—79.ZHENG Jian-xin,HAO Wan-jun.Influence of Vacuum Degree on Gas-Solid Flow in Vacuum Cold Spray[J].Surface Technology,2015,44(12):75—79.
[9]AJDELSZTAJN L,ZUNIGA A,JODOIN B,et al.Cold Gas Dynamic Spraying of a High Temperature Al Alloy[J].Surface&Coatings Technology,2006,201:2109—2116.
[10]VU T N,MOKADDEM M,VOLOVITCH P,et al.The Anodic Dissolution of Zinc Alloys in Alkaline Solution.II.Al and Zn Partial Dissolution from 5%Al-Zn Coatings[J].Electrochim Acta,2012,74:130—138.
[11]MENG X M,ZHANG J B,HAN W,et al.Influence of Annealing Treatment on the Microstructure and Mechanical Performance of Cold Sprayed 304 Stainless Steel Coating[J].Appl Surf Sci,2011,258:700—704.
[12]GOLDBAUM D,SHOCKLEY J,CHROMIK R,ET AL.The Effect of Deposition Conditions on Adhesion Strength of Ti and Ti6Al4V Cold Spray Splats[J].Therm Spray Technol,2012,21(2):288—303.
[13]XIONG Yu-ming,ZHUANG Wu-man,ZHANG Mingxing.Effect of the Thickness of Cold Sprayed Aluminium Alloy Coating on the Adhesive Bond Strength with an Aluminium Alloy Substrate[J].Surface&Coatings Technology,2015,270:259—6.
[14]DOSTA S,COUTO M,GUILEMANY J M.Cold Spray Deposition of a WC-25Co Cermet onto Al7075-T6 and Carbon Steel Substrates[J].Acta Mater.,2013,61:643—652.
[15]KOIVULUOTO H,KYLMALAHTI M,VUORISTO P,et al.Properties of Low-pressure Cold-sprayed Coatings for Repairing of Casting Defects[J].Journal of Thermal Spray Technology,2012,4(1):64—70.
[16]黄国胜.冷喷涂锌涂层微观结构研究[C]//材料腐蚀与控制学术研讨会.北京:表面工程与再制造,2008.HUANG Guo-sheng.Microstructure Research of Cold Sprayed Zn Coating[C]//Academic Conference of Materials Corrosion and Control.Beijing:Surface Engineering&Remanufacturing,2008.
[2]石仲川,张晓云,陈昊,等.高强钢冷喷涂铝锌复合涂层性能研究[J].材料工程,2015,43(2):14—19.SHI Zhong-chuan,ZHANG Xiao-yun,CHEN Hao,et al.Properties of Cold Spray Al/Zn Coatings on Highstrength Steel[J].Journal of Materials Engineering,2015,43(2):14—19.
[3]苏贤涌,周香林,崔华,等.冷喷涂技术的研究进展[J].表面技术,2007,36,(5):71—74.SU Xian-yong,ZHOU Xiang-lin,CUI Hua,et al.Research Progress in Cold Gas Dynamic Spray Technology[J].Surface Technology,2007,36,(5):71—74.
[4]李长久.中国冷喷涂研究进展[J].中国表面工程,2009,22(4):6—14.LI Chang-jiu.Developments of Cold Spray in China[J].China Surface Engineering,2009,22(4):6-14.
[5]李文亚,余敏.冷喷涂技术的最新研究现状[J].表面技术,2010,39(5):95—102.LI Wen-ya,YU Min.Latest Development of Cold Spray Technology[J].Surface Technology,2010,39(5):95—102.
[6]曹京宜,张寒露,张锋,等.不同防污涂层下5083铝合金的海水腐蚀性能研究[J].装备环境工程,2016,13(4):28—34.CAO Jing-yi,ZHANG Han-lu,ZHANG Feng,et al.Seawater Corrosion Performances of 5083 Aluminum Alloy under Antifouling Coating Systems[J].Equipment Environmental Engineering,2016,13(4):28—34.
[7]钟厉,王昭银,张华东.冷喷涂沉积机理极其装备的研究进展[J].表面技术,2015,44(4):15—22.ZHONG Li,WANG Zhao-yin,ZHANG Hua-dong.Research Progress of Precipitation Mechanism and Apparatus of Cold Spray[J].Surface Technology,2015,44(4):15—22.
[8]郑建新,郝婉君.真空度对真空冷喷涂气固两相流的影响[J].表面技术,2015,44(12):75—79.ZHENG Jian-xin,HAO Wan-jun.Influence of Vacuum Degree on Gas-Solid Flow in Vacuum Cold Spray[J].Surface Technology,2015,44(12):75—79.
[9]AJDELSZTAJN L,ZUNIGA A,JODOIN B,et al.Cold Gas Dynamic Spraying of a High Temperature Al Alloy[J].Surface&Coatings Technology,2006,201:2109—2116.
[10]VU T N,MOKADDEM M,VOLOVITCH P,et al.The Anodic Dissolution of Zinc Alloys in Alkaline Solution.II.Al and Zn Partial Dissolution from 5%Al-Zn Coatings[J].Electrochim Acta,2012,74:130—138.
[11]MENG X M,ZHANG J B,HAN W,et al.Influence of Annealing Treatment on the Microstructure and Mechanical Performance of Cold Sprayed 304 Stainless Steel Coating[J].Appl Surf Sci,2011,258:700—704.
[12]GOLDBAUM D,SHOCKLEY J,CHROMIK R,ET AL.The Effect of Deposition Conditions on Adhesion Strength of Ti and Ti6Al4V Cold Spray Splats[J].Therm Spray Technol,2012,21(2):288—303.
[13]XIONG Yu-ming,ZHUANG Wu-man,ZHANG Mingxing.Effect of the Thickness of Cold Sprayed Aluminium Alloy Coating on the Adhesive Bond Strength with an Aluminium Alloy Substrate[J].Surface&Coatings Technology,2015,270:259—6.
[14]DOSTA S,COUTO M,GUILEMANY J M.Cold Spray Deposition of a WC-25Co Cermet onto Al7075-T6 and Carbon Steel Substrates[J].Acta Mater.,2013,61:643—652.
[15]KOIVULUOTO H,KYLMALAHTI M,VUORISTO P,et al.Properties of Low-pressure Cold-sprayed Coatings for Repairing of Casting Defects[J].Journal of Thermal Spray Technology,2012,4(1):64—70.
[16]黄国胜.冷喷涂锌涂层微观结构研究[C]//材料腐蚀与控制学术研讨会.北京:表面工程与再制造,2008.HUANG Guo-sheng.Microstructure Research of Cold Sprayed Zn Coating[C]//Academic Conference of Materials Corrosion and Control.Beijing:Surface Engineering&Remanufacturing,2008.