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Cu-Ti合金在模擬S2-污染海水中的腐蝕行為研究
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太原理工大學(xué) 材料科學(xué)與工程學(xué)院

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國家自然科學(xué)基金資助(52071227),山西省平臺基地建設(shè)項(xiàng)目(018D121003),中央引導(dǎo)地方科技發(fā)展專項(xiàng)資金項(xiàng)目(YDZX20191400002094),山西省高等學(xué)?？萍紕?chuàng)新項(xiàng)目(2019L0170)


Corrosion behavior of Cu-Ti alloy in simulated S2- contaminated seawater
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College of Materials Science and Engineering,Taiyuan University of Technology

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    摘要:

    通過浸泡實(shí)驗(yàn)與電化學(xué)測試,研究了固溶態(tài)Cu-4wt.%Ti合金在模擬污染海水(含S2-的3.5wt.% NaCl溶液)的腐蝕行為。借助掃描電子顯微鏡(SEM)、X射線衍射(XRD)以及X射線光電子能譜儀(XPS)對銅鈦合金表面腐蝕產(chǎn)物進(jìn)行測試分析。結(jié)果表明：含Cl-溶液中銅鈦合金的腐蝕形式為點(diǎn)蝕,點(diǎn)蝕坑尺寸較小,分布均勻。添加S2-后點(diǎn)蝕更容易被誘發(fā),點(diǎn)蝕坑尺寸較大。當(dāng)NaCl溶液中的S2-濃度達(dá)到60ppm時(shí),點(diǎn)蝕坑在合金表面相互連接,呈現(xiàn)出均勻腐蝕的形態(tài)；S2-<和Cl-對銅鈦合金的腐蝕存在競爭吸附,S2-吸附性強(qiáng)對銅鈦合金的腐蝕劇烈；在含S2-的NaCl溶液中腐蝕產(chǎn)物主要為CuS、Cu2S、Cu2O以及Cu2(OH)3Cl。S2-濃度較大時(shí)會導(dǎo)致溶液中OH-濃度增加,使腐蝕產(chǎn)物膜層厚度與致密度增加,因此當(dāng)S2-濃度達(dá)到100ppm時(shí)銅鈦合金能夠發(fā)生鈍化從而減緩腐蝕。

    Abstract:

    The corrosion behavior of Cu-4wt.%Ti alloy in solid solution in simulated polluted seawater (3.5wt.% NaCl solution containing S2-) was studied by immersion test and electrochemical test.Scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were used to test and analyze the corrosion products on the surface of copper titanium alloy.The results show that the Cl- causes pitting corrosion of Cu-Ti alloy in solution, and the pitting pits with uniform distribution are smaller in size. When the concentration of S2- in NaCl solution is 60ppm, the pitting pits are connected with each other on the surface of the alloy, showing uniform corrosion morphology.There is competitive adsorption between S2- and Cl- on the corrosion of Cu-Ti alloy, and S2- Corrosion of copper-titanium alloy is severe due to its strong adsorption.In NaCl solution containing S2-, the corrosion products are mainly CuS, Cu2S, Cu2O and Cu2(OH)3Cl.When S2- concentration is high, the concentration of OH- in the solution will increase, which will increase the thickness and density of the corrosion product film. Therefore, when S2- concentration reaches 100ppm, passivation can occur to the Cu-Ti alloy to slow down the corrosion. Key words: Cu-Ti alloy; S2- pollution; Simulated sea water; Corrosion; Competitive adsorption

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李思遠(yuǎn),宋堅(jiān)磊,衛(wèi)歡,杜華云,衛(wèi)英慧,侯利鋒. Cu-Ti合金在模擬S2-污染海水中的腐蝕行為研究[J].稀有金屬材料與工程,2022,51(3):895~905.[Li Siyuan, Song Jianlei, Wei Huan, Du Huayun, Wei Yinghui, Hou Lifeng. Corrosion behavior of Cu-Ti alloy in simulated S2- contaminated seawater[J]. Rare Metal Materials and Engineering,2022,51(3):895~905.]
DOI：10.12442/j. issn.1002-185X.20210246

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  • 收稿日期:2021-03-23
  • 最后修改日期:2021-04-29
  • 錄用日期:2021-05-24
  • 在線發(fā)布日期: 2022-04-06
  • 出版日期: 2022-03-30