硝酸镧改性无铬达克罗涂层的腐蚀行为与防腐机理
Corrosion Behavior and Anti-corrosion Mechanism of Lanthanum Nitrate Modified Chromium-Free Dacromet Coating
摘 要
以锌粉、铝粉为原料,硝酸镧为添加剂,制备了硝酸镧改性无铬达克罗涂层,研究了改性涂层在质量分数5% NaCl溶液中浸泡后的腐蚀产物物相组成和微观形貌,探究了涂层的腐蚀行为和防腐机理。结果表明:在NaCl溶液中浸泡10 d后,涂层中部分富锌相优先腐蚀形成Zn5(OH)8Cl2·H2O,表面呈蜂窝状形貌;浸泡30 d后,腐蚀产物增多,生成Zn5(OH)6(CO3)2,表面呈海绵状结构;浸泡60 d后,腐蚀产物逐渐溶解、剥落,表面呈三维多孔网络结构。涂层的防腐机理包括腐蚀产物和稀土钝化膜的自修复作用、有机硅烷钝化膜和片状锌铝粉分层堆叠的物理屏蔽作用、锌和铝金属的牺牲阳极作用以及稀土钝化作用和缓蚀剂的缓释作用。
硝酸镧
腐蚀行为
防腐机理
chromate-free dacromet coating
lanthanum nitrate
corrosion behavior
anti-corrosion mechanism
Abstract
With zinc powder and aluminum powder as raw materials and lanthanum nitrate as additive, lanthanum nitrate modified chromium-free Dacromet coating was prepared. The phase composition and micromorphology of the corrosion products of the coating after immersion in 5wt% NaCl solution were studied, and the corrosion behavior and anti-corrosion mechanism of the coating were investigated. The results show that after immersion in NaCl solution for 10 d, some zinc-rich phases in the modified coating were preferentially corroded to form Zn5(OH)8Cl2·H2O, and the surface showed a honeycomb morphology; after immersion for 30 d, the corrosion products increased and Zn5(OH)6(CO3)2 was formed, and the surface showed a sponge-like structure; after immersion for 60 d, the corrosion products gradually dissolved and peeled off, and the surface showed a three-dimensional porous network structure. The anti-corrosion mechanism of the coating included the self-repairing effect of corrosion products and rare earth passivation film, the physical shielding effect of organic silane passivation film and lamellar zinc-aluminum powder overlapping, the sacrificial anodization effect of zinc-aluminum metal, the passivation effect of rare earth and the slow-releasing effect of corrosion inhibitor.
中图分类号 TG174 DOI 10.11973/jxgccl202307006
所属栏目 试验研究
基金项目 河南省科技发展计划项目(1521023102122)
收稿日期 2022/5/8
修改稿日期 2023/5/24
网络出版日期
作者单位点击查看
备注李红玲(1977-),女,河南焦作人,副教授,硕士
引用该论文: LI Hongling,ZHANG Yanling. Corrosion Behavior and Anti-corrosion Mechanism of Lanthanum Nitrate Modified Chromium-Free Dacromet Coating[J]. Materials for mechancial engineering, 2023, 47(7): 37～42
李红玲,章艳玲. 硝酸镧改性无铬达克罗涂层的腐蚀行为与防腐机理[J]. 机械工程材料, 2023, 47(7): 37～42
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【15】CAI J B,SHI X J,SONG J A,et al.Comprehensive performance test and analysis of graphene-enhanced chromium-free Dacromet coating[J].Corrosion Reviews,2020,38(5):445-461.
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【17】ZHANG K B,ZHANG M M,QIAO J F,et al.Enhancement of the corrosion resistance of zinc-aluminum-chromium coating with cerium nitrate[J].Journal of Alloys and Compounds,2017,692:460-464.
【18】刘淑荣,陈丽娟.稀土对锌铝合金镀层作用机理的研究[J].中国稀土学报,1993,11(2):139-143. LIU S R,CHEN L J.Study on mechanism of rare earth on Zn-Al alloy coating[J].Journal of the Chinese Rare Earth Society,1993,11(2):139-143.
【19】LIU X X,KONG D.Salt spray corrosion and electrochemical corrosion performances of Dacromet fabricated Zn-Al coating[J]. Anticorrosion Methods and Materials, 2019,66(5):565-572.
【20】KIM K H,KUMAR B,LEE K Y,et al.Piezoelectric two-dimensional nanosheets/anionic layer heterojunction for efficient direct current power generation[J].Scientific Reports,2013,3:2017.
【21】李新波,曾鹏,谢光荣,等.稀土镧盐对水性锌铝涂层的钝化作用[J].材料保护,2011,44(10):19-22. LI X B,ZENG P,XIE G R,et al.Effect of rare earth lanthanum salt on passivation of water-borne Zn-Al coating[J].Materials Protection,2011,44(10):19-22.
【22】李翰.前处理工艺对鳞片状Zn-Al合金环氧涂层性能影响的研究[D].南京:南京航空航天大学,2019:33-35. LI H.Research on the effect of pretreatment process on the performance of scaly Zn-Al alloy epoxy coating[D].Nanjing:Nanjing University of Aeronautics and Astronautics,2019:33-35.
【23】HUANG H H,WANG H N,LI B R,et al.Seedless synthesis of layered ZnO nanowall networks on Al substrate for white light electroluminescence[J].Nanotechnology,2013,24(31):315203.
【24】VOLOVITCH P,ALLELY C,OGLE K.Understanding corrosion via corrosion product characterization:I.Case study of the role of Mg alloying in Zn-Mg coating on steel[J].Corrosion Science,2009,51(6):1251-1262.
【25】邢婉晴,陈文革.新型达克罗涂层的制备与组织结构[J].表面技术,2022,51(12):169-177. XING W Q,CHEN W G.Preparation and microstructure of new-type dacromet coating[J].Surface Technology,2022,51(12):169-177.
【26】QU Q,YAN C W,WAN Y,et al.Effects of NaCl and SO2 on the initial atmospheric corrosion of zinc[J].Corrosion Science,2002,44(12):2789-2803.
【27】VU T N,VOLOVITCH P,OGLE K.The effect of pH on the selective dissolution of Zn and Al from Zn-Al coatings on steel[J].Corrosion Science,2013,67:42-49.
【28】LIU Y,LI H Y,LI Z G.EIS investigation and structural characterization of different hot-dipped zinc-based coatings in 3.5% NaCl solution[J].International Journal of Electrochemical Science,2013,8(6):7753-7767.
【29】彭天兰,满瑞林,梁永煌.镀锌钢板硅烷与稀土铈盐、镧盐复合钝化的性能及机理[J].材料保护,2009,42(3):5-8. PENG T L,MAN R L,LIANG Y H.Properties of galvanized steel passivated by silane and rare earth cerium and lanthanum[J].Materials Protection,2009,42(3):5-8.
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