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鎂合金微弧氧化涂層表面原位制備MgCr-LDH層及其耐蝕防護(hù)機(jī)制研究
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1.福州大學(xué) 材料科學(xué)與工程學(xué)院;2.福建工程學(xué)院 材料科學(xué)與工程學(xué)院;3.哈爾濱工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院

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國家自然科學(xué)基金 (51871057, 51771064), 福建省自然科學(xué)基金(2019J01227), 福建省教育廳科技基金(JK2015030)


In situ preparation MgCr-LDH layer on MAO coating of Mg alloy and study its anti-corrosion protection mechanism
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1.School of Materials Science and Engineering,Fuzhou University,New Campus,Minhou,Fujian Province;2.School of Materials Science and Engineering,Harbin Institute of Technology

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    摘要:

    為了進(jìn)一步提升鎂合金耐蝕性,將水滑石(layered double hydroxides LDH)與微弧氧化結(jié)合(MAO)制備一種主動防護(hù)的高耐蝕復(fù)合涂層。本文采用原位法成功在AZ31鎂合金MAO涂層表面制備了層間含NO3-的MgCr-LDH層,構(gòu)成LDH/MAO復(fù)合涂層,研究原有MAO涂層表面LDH的微觀組織結(jié)構(gòu)及其與原始MAO涂層的相互作用,并利用長時間浸泡法和電化學(xué)法測試MgCr-LDH/MAO復(fù)合涂層試樣在3.5wt%NaCl溶液中的耐蝕性能,揭示LDH層耐蝕保護(hù)機(jī)理,研究結(jié)果顯示：LDH易于在鎂合金表面MAO層的孔洞中形成,最終生成均勻致密片狀結(jié)構(gòu)的層。LDH的原位生長過程對原始MAO涂層沒有破壞,MgCr-LDH與MAO涂層之間屬于化學(xué)結(jié)合,具有強的粘附性與機(jī)械穩(wěn)定性。MgCr-LDH/MAO復(fù)合涂層明顯提高了AZ31鎂合金的耐腐蝕性能,LDH層的其防腐保護(hù)機(jī)制主要表現(xiàn)為兩部分,一是LDH均勻形成于原始MAO層上,有效的覆蓋了MAO層的孔洞與裂紋,阻擋氯離子通過MAO涂層的固有缺陷進(jìn)入合金基體產(chǎn)生破壞。二是LDH的硝酸根層間陰離子能夠與腐蝕環(huán)境中的氯離子進(jìn)行離子交換,降低溶液中的氯離子濃度,從而延長涂層的耐蝕保護(hù)性。

    Abstract:

    A high corrosion resistant and active protection composite coating designed combining Layered Double Hydroxides (LDH) layer and Micro-arc Oxidation (MAO) to further improve the anti-corrosion of Mg alloy. In this paper, MgCr-LDHs/MAO composite coating prepared through in-situ growing LDH layer including NO3- on the surface of MAO coating. The morphology、composition and microstructure of MgCr-LDHs/MAO composite coating were characterized by XRD, XPS, FT-IR, SEM, besides the interaction of LDH and original MAO coating was investigated. The corrosion properties of MgCr-LDHs/MAO coating was tested through immersion in 3.5wt%NaCl solution and electrochemical experiments. The results show that: (1) the LDHs forms a dense sheet like layer on the original MAO coating surface, which can effectively cover the inherent defects of MAO coating, and LDH layer is preferentially formed in the pores of original MAO coating. (2) LDHs don"t damage the original MAO coating during the growth process, besides the adhesion of LDH layer and MAO layer are strong and stable. (3) The composite coating showed the most superior corrosion protection, since MgCr-LDH layer growing on the original MAO coating can hinder the penetration of chloride ions and effectively adsorb a large number of NO3? to exchange Cl- in corrosion solution.

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引用本文

梁思琰,任魏巍,林文鑫,鄒林池,崔喜平,陳俊鋒.鎂合金微弧氧化涂層表面原位制備MgCr-LDH層及其耐蝕防護(hù)機(jī)制研究[J].稀有金屬材料與工程,2020,49(8):2830~2838.[Liang Siyan, Ren weiwei, Lin Wenxin, Zou Linchi, Cui Xiping, Chen Junfeng. In situ preparation MgCr-LDH layer on MAO coating of Mg alloy and study its anti-corrosion protection mechanism[J]. Rare Metal Materials and Engineering,2020,49(8):2830~2838.]
DOI：10.12442/j. issn.1002-185X.20190621

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  • 收稿日期:2019-07-27
  • 最后修改日期:2019-09-23
  • 錄用日期:2019-10-11
  • 在線發(fā)布日期: 2020-09-27
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