@25℃=9.5)的電化學(xué)性能。試驗結(jié)果表明：在不同溫度下(50,100,150,200,250或285℃)的氨水溶液中浸泡20h后,690合金的開路電位都已到達(dá)較穩(wěn)定狀態(tài),表面有雙層氧化膜生成,隨著溫度的升高,外層氧化膜阻值先減小后增加,內(nèi)層氧化膜阻值逐漸減小,而總的氧化膜保護(hù)性逐漸降低。再結(jié)合試驗溫度下溶液pH@T的降低,導(dǎo)致690合金的開路電位下降,由極化曲線獲得的腐蝕電流密度和維頓電流密度增加。"/>

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690合金高溫電化學(xué)性能研究
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上海交通大學(xué)核科學(xué)與工程學(xué)院,上海交通大學(xué)核科學(xué)與工程學(xué)院,上海交通大學(xué)核科學(xué)與工程學(xué)院,上海核工程研究設(shè)計院,上海核工程研究設(shè)計院

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重大專項CAP1400關(guān)鍵設(shè)計技術(shù)研究(項目號：2010ZX06002-001)


The Study on High Temperature Electrochemcial Behaviors of Alloy 690
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School of Nuclear Science and Engineering,Shanghai Jiao Tong University,School of Nuclear Science and Engineering,Shanghai Jiao Tong University,School of Nuclear Science and Engineering,Shanghai Jiao Tong University,Shanghai Nuclear Engineering Research Design Institute,Shanghai Nuclear Engineering Research Design Institute

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    摘要:

    采用開路電位監(jiān)測、電化學(xué)阻抗譜、動電位極化曲線測量和熱力學(xué)分析等方法,研究690合金在模擬壓水堆二次側(cè)高溫高壓堿性水環(huán)境中(氨水調(diào)節(jié)pH@25℃=9.5)的電化學(xué)性能。試驗結(jié)果表明：在不同溫度下(50,100,150,200,250或285℃)的氨水溶液中浸泡20h后,690合金的開路電位都已到達(dá)較穩(wěn)定狀態(tài),表面有雙層氧化膜生成,隨著溫度的升高,外層氧化膜阻值先減小后增加,內(nèi)層氧化膜阻值逐漸減小,而總的氧化膜保護(hù)性逐漸降低。再結(jié)合試驗溫度下溶液pH@T的降低,導(dǎo)致690合金的開路電位下降,由極化曲線獲得的腐蝕電流密度和維頓電流密度增加。

    Abstract:

    The electrochemical behaviors of Alloy 690 was studied in simulated PWR secondary loop high temperature and high pressure alkaline water environments controlling pH (pH@25℃=9.5) with ammonia-water by measuring open circuit potentials (OCP), electrochemical impedance spectroscopies (EIS), potentiodynamic (PD) polarization curves and thermomechanical analysis. The results showed that: After immersing in ammonia-water at the given temperature (50, 100, 150, 200, 250 or 285℃) for 20h, the OCPs of Alloy 690 have reached a rather steady state and the double-layer oxide films have formed on the Alloy 690. With the increasing temperature, the resistances of outer oxide layer firstly decrease and then increase, while the resistances of the inner oxide layer and the protection of the whole oxide films decrease. In addition, the solution pH@T decreases with the increasing temperature. All of the above causes the decline of OCPs, corrosion current densities and passive current densities from the PD curves.

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陸輝,汪家梅,張樂福,孟凡江,石秀強(qiáng).690合金高溫電化學(xué)性能研究[J].稀有金屬材料與工程,2017,46(10):2969~2974.[LU Hui, WANG Jia-mei, ZHANG Le-fu, MENG Fan-jiang, SHI Xiu-qiang. The Study on High Temperature Electrochemcial Behaviors of Alloy 690[J]. Rare Metal Materials and Engineering,2017,46(10):2969~2974.]
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  • 收稿日期:2015-06-23
  • 最后修改日期:2015-07-14
  • 錄用日期:2015-09-07
  • 在線發(fā)布日期: 2017-12-01
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