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Inconel625合金及焊縫在Na2SO4-NaCl熔鹽中熱腐蝕行為研究
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蘭州理工大學(xué)材料科學(xué)與工程學(xué)院

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甘肅省科技重大專項（18ZD2GC013）


Hot Corrosion Behavior of Inconel625 Alloy and Welds in Na2SO4-NaCl Molten Salt
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    摘要:

    對Inconel625母材與焊縫金屬進(jìn)行750℃下的75% Na2SO4-25%NaCl混合熔鹽熱腐蝕實驗，并對腐蝕產(chǎn)物的物相、表面形貌、腐蝕失重速率及腐蝕機(jī)理等進(jìn)行研究分析。結(jié)果表明:Inconel625接頭母材處組織為奧氏體等軸晶，焊縫處組織為樹枝晶；母材與焊縫金屬失重曲線均遵循拋物線規(guī)律，其失重速率常數(shù)分別為3.43和4.18；焊縫金屬因為富Nb第二相的析出，導(dǎo)致其與母材相比耐蝕性較差，腐蝕表現(xiàn)出“不均勻性”；兩種狀態(tài)下的Inconel625有著相同的腐蝕層結(jié)構(gòu)均為，外層NiO顆粒和片層狀NiCr2O4，中層致密Cr2O3氧化層，內(nèi)層“蜂窩”狀Ni2S3硫化層的3層結(jié)構(gòu)；Inconel625合金在750℃下75%Na2SO4-25%NaCl混合鹽中的主要腐蝕機(jī)理為:“硫化-氧化”腐蝕。

    Abstract:

    Inconel 625 base metal and weld metal were subjected to 75% Na2SO4-25% NaCl mixed molten salt hot corrosion experiments at 750°C. The physical phase, surface morphology, corrosion weight loss rate and corrosion mechanism of corrosion products were studied and analyzed. The results show that the organization of Inconel 625 joints is austenitic equiaxial crystal at the base material and dendrite at the weld. The weight loss curves of both base metal and weld metal follow parabolic laws with weight loss rate constants of 3.43 and 4.18, respectively. The weld metal is less resistant to corrosion compared to the base material due to the precipitation of Nb-rich second phase, and corrosion exhibits "inhomogeneity". Inconel 625 in both states has the same corrosion layer structure, the outer layer of NiO particles and lamellar NiCr2O4, the middle layer of dense Cr2O3 oxide layer, and the inner layer of "honeycomb" Ni2S3 sulfide layer of the three-layer structure. The main corrosion mechanism of Inconel 625 alloy in 75% Na2SO4-25% NaCl mixed salt at 750°C is: "sulfidation-oxidation" corrosion.

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張忠科,熊健強(qiáng),初樹晟,李軒柏,蔣常銘. Inconel625合金及焊縫在Na2SO4-NaCl熔鹽中熱腐蝕行為研究[J].稀有金屬材料與工程,2023,52(5):1842~1850.[Zhang Zhongke, Xiong Jianqiang, Chu Shusheng, Li Xuanbai, Jiang Changmin. Hot Corrosion Behavior of Inconel625 Alloy and Welds in Na2SO4-NaCl Molten Salt[J]. Rare Metal Materials and Engineering,2023,52(5):1842~1850.]
DOI：10.12442/j. issn.1002-185X.20220361

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  • 收稿日期:2022-04-27
  • 最后修改日期:2022-07-17
  • 錄用日期:2022-08-11
  • 在線發(fā)布日期: 2023-06-08
  • 出版日期: 2023-05-29