2的熔融氯化鹽對(duì)金屬傳熱管道和儲(chǔ)熱容器腐蝕后在其表面形成MgO，MgO對(duì)管道耐腐蝕性能影響尚不清楚。通過對(duì)比碳鋼和3種Fe-Cr-Ni合金在固態(tài)（345 ℃）和熔融NaCl-MgCl2（445和545 ℃）中的腐蝕行為，分析了MgO對(duì)4種試樣在不同溫度下的腐蝕行為機(jī)理。結(jié)果表明，在固態(tài)NaCl-MgCl2中，碳鋼表面MgO殼致密且連續(xù)，可以保護(hù)試樣免受腐蝕。在熔融NaCl-MgCl2中，4種試樣表面也生成了致密的MgO殼，但它因熱應(yīng)力作用而開裂和剝落，熔融鹽沿著氧化膜裂紋滲入MgO/基體界面，發(fā)生化學(xué)-電化學(xué)聯(lián)合腐蝕反應(yīng)，不能保護(hù)試樣免受該熔鹽腐蝕。"/>

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腐蝕產(chǎn)物MgO對(duì)Fe基合金在固態(tài)和熔融NaCl-MgCl2 中高溫耐蝕性能的影響
作者:
作者單位:

1.青海大學(xué) 機(jī)械工程學(xué)院，青海 西寧 810016;2.集美大學(xué) 廈門市海洋腐蝕與智能防護(hù)材料重點(diǎn)實(shí)驗(yàn)室，福建 廈門 361021;3.青海大學(xué) 青海省高性能輕金屬合金及深加工工程技術(shù)研究中心，青海 西寧 810016

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基金項(xiàng)目:

NSFC(51441003), Qinghai Natural Science Foundation (2015-ZJ-931Q), Research Foundation of Jimei University(ZQ2021052), National key research and development program(2020YFE0100100).


Effects of Corrosion Product MgO on Corrosion Resistance of Fe-based Alloys in Solid and Molten NaCl-MgCl2 at High Temperature
Author:
Affiliation:

1.Department of Mechanical Engineering, Qinghai University, Xining 810016, China;2.Xiamen Key Laboratory of Marine Corrosion and Smart Protective Materials, Jimei University, Xiamen 361021, China;3.Engineering Research Center of High Performance Light Metal Alloys and Forming, Qinghai University, Xining 810016, China

Fund Project:

National Natural Science Foundation of China (51441003); Qinghai Natural Science Foundation (2015-ZJ-931Q); Research Foundation of Jimei University (ZQ2021052); National Key Research and Development Program (2020YFE0100100)

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    摘要:

    熔融氯化鹽是下一代聚光式太陽能熱發(fā)電站（第3代CSP）候選傳熱和儲(chǔ)熱介質(zhì)，含MgCl2的熔融氯化鹽對(duì)金屬傳熱管道和儲(chǔ)熱容器腐蝕后在其表面形成MgO，MgO對(duì)管道耐腐蝕性能影響尚不清楚。通過對(duì)比碳鋼和3種Fe-Cr-Ni合金在固態(tài)（345 ℃）和熔融NaCl-MgCl2（445和545 ℃）中的腐蝕行為，分析了MgO對(duì)4種試樣在不同溫度下的腐蝕行為機(jī)理。結(jié)果表明，在固態(tài)NaCl-MgCl2中，碳鋼表面MgO殼致密且連續(xù)，可以保護(hù)試樣免受腐蝕。在熔融NaCl-MgCl2中，4種試樣表面也生成了致密的MgO殼，但它因熱應(yīng)力作用而開裂和剝落，熔融鹽沿著氧化膜裂紋滲入MgO/基體界面，發(fā)生化學(xué)-電化學(xué)聯(lián)合腐蝕反應(yīng)，不能保護(hù)試樣免受該熔鹽腐蝕。

    Abstract:

    Molten chloride salt is a candidate heat transfer medium (HTM) for the next generation high temperature concentrating solar power (CSP). A corrosion product MgO will be formed on metal surface in the molten chloride containing MgCl2. Based on the corrosion behavior comparison of a carbon steel and three kinds of Fe-Cr-Ni alloys in solid (345 °C) and molten state NaCl-MgCl2 (445 and 545 °C), the effects of MgO on corrosion resistance of the four kinds of samples were discussed. Results show that in solid eutectic NaCl-MgCl2 at 345 °C, the MgO layer is dense and complete on the carbon steel surface, which can protect the specimen from corrosion. In the molten salt, a dense MgO layer is also formed on the four kinds of sample surface, but the molten salt penetrates the MgO/matrix interface along cracks of the oxide layer due to the peeling off of MgO layer under thermal stress, which cannot protect specimen from corrosion. The corrosion mechanism is the chemical-electrochemistry reactions.

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引用本文

常麗梅,張世洲,文茜,席吉輝,吳波,王軍偉.腐蝕產(chǎn)物MgO對(duì)Fe基合金在固態(tài)和熔融NaCl-MgCl2 中高溫耐蝕性能的影響[J].稀有金屬材料與工程,2022,51(12):4452~4463.[Chang Limei, Zhang Shizhou, Wen Qian, Xi Jihui, Wu Bo, Wang Junwei. Effects of Corrosion Product MgO on Corrosion Resistance of Fe-based Alloys in Solid and Molten NaCl-MgCl2 at High Temperature[J]. Rare Metal Materials and Engineering,2022,51(12):4452~4463.]
DOI：10.12442/j. issn.1002-185X.20220020

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  • 收稿日期:2022-01-10
  • 最后修改日期:2022-11-24
  • 錄用日期:2022-02-09
  • 在線發(fā)布日期: 2023-01-11
  • 出版日期: 2022-12-30