2SO4+25 wt.% NaCl和2% SO2+H2O+Air)腐蝕120 h后的高溫腐蝕行為,探討了不同腐蝕介質(zhì)下氧化膜的形成及破壞機制。研究表明,GH3625合金在不同介質(zhì)中腐蝕后,從合金最表層到合金內(nèi)部結(jié)構(gòu)均分為疏松氧化層、致密氧化層、貧Cr區(qū)和合金基體,其氧化層主要由NiO、Cr2O3和NiCr2O4組成。同時,合金在熔鹽和高溫酸性氣氛中腐蝕后的貧Cr區(qū)深度(約14 μm和11μm)均大于在空氣中氧化后貧Cr區(qū)深度(約8 μm),腐蝕介質(zhì)對合金表層氧化膜的破壞程度從大到小依次為熔鹽介質(zhì)、高溫酸性氣氛介質(zhì)、空氣介質(zhì)。合金的腐蝕主要是不同介質(zhì)下合金表層氧化膜的形成與溶解的相互競爭,當(dāng)GH3625合金在熔鹽介質(zhì)中腐蝕時,腐蝕機制主要是氧化膜與Cl-反應(yīng)生成氣相Cl2和與Na2O反應(yīng)生成鉻酸鹽Na2CrO4；而當(dāng)GH3625合金在酸性氣氛介質(zhì)中腐蝕時,腐蝕機制主要是Cr、Ni元素與SO2、O2的連續(xù)硫化和氧化反應(yīng)。"/>

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介質(zhì)對GH3625合金高溫腐蝕中氧化膜的影響機制
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作者單位:

蘭州理工大學(xué) 省部共建有色金屬先進加工與再利用國家重點實驗室

作者簡介:

通訊作者:

中圖分類號:

TG172；TG132.3+3

基金項目:

國家重點研發(fā)計劃項目(2017YFA0700703)；國家自然科學(xué)(51661019)；甘肅省科技重大專項項目(145RTSA004)；蘭州理工大學(xué)紅柳一流學(xué)科建設(shè)計劃


Influence of Media on Oxidation Film in High Temperature Corrosion of GH3625 Alloy
Author:
Affiliation:

Lanzhou University of Technology State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals

Fund Project:

National Key Research and Development Program of China (2017YFA07007003); National Natural Science Foundation of China (51661019); the program for Major Projects of Science and Technology in Gansu Province (145RTSA004), Hongliu first-class discipline construction plan of Lanzhou University of Technology

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    摘要:

    本文采用XRD、SEM、EDS、增重法測量和熱力學(xué)計算等手段研究了鑄態(tài)GH3625合金在900 ℃下不同腐蝕介質(zhì)中(Air、75 wt.% Na2SO4+25 wt.% NaCl和2% SO2+H2O+Air)腐蝕120 h后的高溫腐蝕行為,探討了不同腐蝕介質(zhì)下氧化膜的形成及破壞機制。研究表明,GH3625合金在不同介質(zhì)中腐蝕后,從合金最表層到合金內(nèi)部結(jié)構(gòu)均分為疏松氧化層、致密氧化層、貧Cr區(qū)和合金基體,其氧化層主要由NiO、Cr2O3和NiCr2O4組成。同時,合金在熔鹽和高溫酸性氣氛中腐蝕后的貧Cr區(qū)深度(約14 μm和11μm)均大于在空氣中氧化后貧Cr區(qū)深度(約8 μm),腐蝕介質(zhì)對合金表層氧化膜的破壞程度從大到小依次為熔鹽介質(zhì)、高溫酸性氣氛介質(zhì)、空氣介質(zhì)。合金的腐蝕主要是不同介質(zhì)下合金表層氧化膜的形成與溶解的相互競爭,當(dāng)GH3625合金在熔鹽介質(zhì)中腐蝕時,腐蝕機制主要是氧化膜與Cl-反應(yīng)生成氣相Cl2和與Na2O反應(yīng)生成鉻酸鹽Na2CrO4；而當(dāng)GH3625合金在酸性氣氛介質(zhì)中腐蝕時,腐蝕機制主要是Cr、Ni元素與SO2、O2的連續(xù)硫化和氧化反應(yīng)。

    Abstract:

    The corrosion behavior of as-cast GH3625 alloy were studied in different corrosive media (Air、75 wt% Na2SO4+25 wt% NaCl and 2% SO2+H2O+Air) at 900 ℃ for 120 h, utilizing XRD, SEM, EDS, weight-gain measurement and thermodynamic calculation. The formation and destruction mechanism of the oxide film under different corrosive media were discussed. Results show that from the top layer to the internal structure of GH3625 alloy is divided into loose oxide layer, dense oxide layer, Cr poor zone and alloy matrix after corrosion in different media, which is mainly composed of NiO, Cr2O3 and NiCr2O4. In addition, the depth of Cr-poor zone after corrosion in corrosive medium (14μm and 11μm) is greater than that after oxidation in air (8μm). The damage degree of corrosion medium to the surface oxide film of the alloy is molten salt medium, acidic atmosphere medium and air medium in descending order. The corrosion of GH3625 alloy is mainly due to the competition between the formation and dissolution of the surface oxide film in different media. When GH3625 alloy is corroded in 75 wt.% Na2SO4+25 wt.% NaCl medium, the corrosion mechanism is mainly that the oxide film reacts with Cl- to form gas phase Cl2 and reacts with Na2O to form chromate Na2Cro4. However, when GH3625 alloy is corroded in 2% SO2+H2O+Air, the corrosion mechanism is mainly the continuous sulfurization and oxidation reaction of Cr, Ni and SO2 and O2.

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馬元俊,丁雨田,劉建軍,高鈺璧,陳建軍,王興茂.介質(zhì)對GH3625合金高溫腐蝕中氧化膜的影響機制[J].稀有金屬材料與工程,2022,51(5):1713~1723.[mayuanjun, dingyutain, liujianjun, gaoyubi, chenjianjun, wangxingmao. Influence of Media on Oxidation Film in High Temperature Corrosion of GH3625 Alloy[J]. Rare Metal Materials and Engineering,2022,51(5):1713~1723.]
DOI：10.12442/j. issn.1002-185X.20210364

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  • 收稿日期:2021-04-25
  • 最后修改日期:2021-05-14
  • 錄用日期:2021-06-22
  • 在線發(fā)布日期: 2022-06-09
  • 出版日期: 2022-05-30