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中国腐蚀与防护学报  2019, Vol. 39 Issue (2): 138-144    DOI: 10.11902/1005.4537.2018.166
  研究报告 本期目录 | 过刊浏览 |
022Cr25Ni7Mo4N双相不锈钢选择性腐蚀行为与两相组织的关系研究
丰涵(),宋志刚,吴晓涵,李惠,郑文杰,朱玉亮
钢铁研究总院特殊钢研究所 北京 100081
Relationship Between Selective Corrosion Behavior and Duplex Structure of 022Cr25Ni7Mo4N Duplex Stainless Steel
Han FENG(),Zhigang SONG,Xiaohan WU,Hui LI,Wenjie ZHENG,Yuliang ZHU
Institute for Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China
全文: PDF(4589 KB)   HTML
摘要: 

采用电化学测试、热力学计算以及SEM、AES和XPS分析等方法研究了022Cr25Ni7Mo4N双相不锈钢选择性腐蚀行为与两相组织的关系。结果表明:022Cr25Ni7Mo4N双相不锈钢阳极极化曲线具有明显的“活化-钝化-过钝化”三段特征;在活化向钝化转换区间,存在两个阳极活化峰并分别对应-236~-238 mV的γ相溶解电位Eh和-287~-294 mV的α相溶解电位El;022Cr25Ni7Mo4N钢具有更高的El电位、更低的Eh电位及更小的阳极活化电位差ΔE,这与该钢较小的两相PREN差值相关;增加Cr、Mo、N含量可同时提升实验用钢αγ两相PREN值,25.4%Cr,4.8%Mo和0.28%N (质量分数) 成分条件下,两相间PREN值均可实现平衡;实验钢钝化膜中Cr主要以Cr2O3氧化物存在,α相处钝化膜过渡区宽度较γ相处的更窄。

关键词 双相不锈钢两相组织选择性腐蚀PREN值钝化膜    
Abstract

The relationship between the selective corrosion behavior and the microstructure of 022Cr25Ni7Mo4N duplex stainless steel was studied by means of electrochemical test, thermodynamic calculation, SEM, AES and XPS. The results show that the anodic polarization curve of test steel has obviously three stages, activation-passivation-transpassivation. In the conversion interval of activation to passivation, there exist two anode activation peak potentials, Eh=-236~-238 mV and El=-287~-294 mV, which may corresponds to the dissolution potential of γ-phase and α-phase respectively. 022Cr25Ni7 Mo4N steel has a higher El potential, a lower Eh potential and a smaller anode activation potential difference ΔE, which is related to the smaller difference of pitting resistance equivalent number (ΔPREN) between α-phase and γ-phase of the steel. The increase of Cr, Mo and N content can simultaneously increase the PREN value of α-phase and γ-phase of the test steel, and it can reach the balance of PREN between the two phases for the steel composed of 25.4%Cr, 4.8%Mo and 0.28%N (mass fraction). In such case, the Cr in the passive film is mainly as the chromia Cr2O3, and the transition zone width of the passivation film on α-phase is narrower than that on γ-phase.

Key wordsduplex stainless steel    duplex structure    selective corrosion    PREN value    passivation film
收稿日期: 2018-11-13     
ZTFLH:  TG142.2  
基金资助:国家重点研发计划(2016YFB0300201)
通讯作者: 丰涵     E-mail: fenghan@nercast.com
Corresponding author: Han FENG     E-mail: fenghan@nercast.com
作者简介: 丰涵,男,1983年生,博士生,高级工程师

引用本文:

丰涵,宋志刚,吴晓涵,李惠,郑文杰,朱玉亮. 022Cr25Ni7Mo4N双相不锈钢选择性腐蚀行为与两相组织的关系研究[J]. 中国腐蚀与防护学报, 2019, 39(2): 138-144.
Han FENG, Zhigang SONG, Xiaohan WU, Hui LI, Wenjie ZHENG, Yuliang ZHU. Relationship Between Selective Corrosion Behavior and Duplex Structure of 022Cr25Ni7Mo4N Duplex Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2019, 39(2): 138-144.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2018.166      或      https://www.jcscp.org/CN/Y2019/V39/I2/138

图1  两种双相不锈钢试样在2 mol/L H2SO4+0.5 mol/L HCl混合溶液中的极化曲线及局部放大图
SteelEcorr / mVEb / mVIp / μA·cm-2El / mVEh / mVΔE / mV
022Cr25Ni7Mo4N-sample 1-3309307.31-287-23651
022Cr25Ni7Mo4N-sample 2-32795022.34-294-23856
022Cr22Ni5Mo3N-sample 1-36394568.39-323-216107
022Cr22Ni5Mo3N-sample 2-368940111.70-332-212120
表1  两种双相不锈钢极化曲线分析结果
图2  022Cr25Ni7Mo4N双相不锈钢试样的原始两相组织以及试样在2 mol/L H2SO4+0.5 mol/L HCl混合溶液中的不同电位恒电位极化后的表面形貌
SteelTest positionCrNiMoFePRENΔPRENResidual phase
022Cr25Ni7Mo4NBase metal25.046.823.56Bal.36.8---
Sample 1 at Ehfor 48 h

26.31

27.22

26.78

5.68

5.67

5.28

4.55

4.37

4.26

59.95

59.87

60.66

41.3

41.6

40.8

7.1α
Sample 2 at Elfor 48 h23.128.693.4659.9534.5γ
23.048.962.9259.8732.7
23.368.353.5760.6635.1
022Cr22Ni5Mo3N[9]Base metal22.405.423.24Bal.33.1
Sample 1 at Ehfor 30 min24.227.755.8359.5643.511.4α
Sample 2 at Elfor 30 min20.488.073.5367.1632.1γ
表2  两种双相不锈钢经不同电位恒电位极化后残留基体的EDX分析结果
ElementContent / %PRENαPRENγ
MinMaxΔMinMaxΔMinMaxΔ
Cr24.026.02.041.4642.651.1940.2943.172.88
Mo3.05.02.039.5542.903.3539.2942.623.33
N0.240.320.0841.9142.510.6041.1143.212.10
表3  不同Cr,Mo,N含量022Cr25Ni7Mo4N钢的两相PREN值 (1150 ℃)
图3  1150 ℃时不同元素含量与022Cr25Ni7Mo4N钢ΔPREN值的对应关系
图4  00Cr25Ni7Mo4N钢试样载波钝化后的组织
图5  00Cr25Ni7Mo4N钢α和γ两相的AES能谱
图6  00Cr25Ni7Mo4N钢两相处的主要元素浓度随深度的分布图
SeriseCr2p3/2O1s
Metallic state574.3---
CrO2576.1529.9
Cr2O3576.7531.0
CrOOH577.0531.2
Cr(OH)3577.3531.2
表4  PHI 5300 ESCA提供参考的不锈钢中铬化合物标准光电子结合能
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