干湿比对CrNiMoV钢在120 mmol/L NH4H2PO4溶液中电化学腐蚀行为的影响

doi:10.11902/1005.4537.2021.340

中国腐蚀与防护学报

2022, Vol. 42

Issue (6): 948-958 DOI: 10.11902/1005.4537.2021.340

研究报告

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干湿比对CrNiMoV钢在120 mmol/L NH₄H₂PO₄溶液中电化学腐蚀行为的影响

王通¹^,², 孟惠民¹, 郭维华²^,³, 葛鹏飞¹^,², 巩秀芳²^,³, 倪荣²^,³, 龚显龙²^,³, 戴君²^,³, 隆彬²^,³, 李全德²^,³(

)

1.北京科技大学新材料技术研究院北京 100083
2.长寿命高温材料国家重点实验室德阳 618000
3.东方汽轮机有限公司德阳 618000

Influence of Dry-wet Ratio on Electrochemical Corrosion Behavior of CrNiMoV Steel in 120 mmol/L NH₄H₂PO₄ Solution

WANG Tong¹^,², MENG Huimin¹, GUO Weihua²^,³, GE Pengfei¹^,², GONG Xiufang²^,³, NI Rong²^,³, GONG Xianlong²^,³, DAI Jun²^,³, LONG Bin²^,³, LI Quande²^,³(

)

1. Institute of Advance Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
2. State Key Laboratory of Long-life High Temperature Materials, Deyang 618000, China
3. Dongfang Turbine Co. Ltd., Deyang 618000, China

引用本文:

王通, 孟惠民, 郭维华, 葛鹏飞, 巩秀芳, 倪荣, 龚显龙, 戴君, 隆彬, 李全德. 干湿比对CrNiMoV钢在120 mmol/L NH₄H₂PO₄溶液中电化学腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2022, 42(6): 948-958.
Tong WANG, Huimin MENG, Weihua GUO, Pengfei GE, Xiufang GONG, Rong NI, Xianlong GONG, Jun DAI, Bin LONG, Quande LI. Influence of Dry-wet Ratio on Electrochemical Corrosion Behavior of CrNiMoV Steel in 120 mmol/L NH₄H₂PO₄ Solution[J]. Journal of Chinese Society for Corrosion and protection, 2022, 42(6): 948-958.

全文: PDF(15665 KB) HTML

摘要:

通过激光共聚焦显微镜 (CLSM)、X射线衍射仪 (XRD)、X射线光电子能谱 (XPS)、开路电位、电化学阻抗谱等研究了在外界温度为 (25±2)℃,湿度为 (55±5)%的空气中干燥,120 mmol/L NH₄H₂PO₄溶液中浸润的干湿交替环境下干湿比的变化对2Cr-1Ni-1.2Mo-0.2V钢和2Cr-4Ni-0.4Mo-0.1V钢的电化学腐蚀行为影响。结果表明：在干湿比为0、1/3、1、3条件下实验21 d后,两种钢发生均匀腐蚀和点蚀,且随着干湿比增大,两种钢的腐蚀速率增大,点蚀程度变大,但2Cr-1Ni-1.2Mo-0.2V钢的耐蚀性优于2Cr-4Ni-0.4Mo-0.1V钢。两种钢的腐蚀产物膜主要由Fe₃(PO₄)₂、FePO₄、Fe₂O₃、FeOOH构成,且随着干湿比增大,FeOOH和Fe₃(PO₄)₂含量减少,Fe₂O₃含量增多。随着干湿比的增大,两种钢的开路电位负移,电荷转移电阻变小,但2Cr-4Ni-0.4Mo-0.1V钢的腐蚀速率高于2Cr-1Ni-1.2Mo-0.2V钢。

关键词 ： CrNiMoV钢, NH₄H₂PO₄, 干湿交替, 干湿比, 腐蚀

Abstract：

The effect of dry-wet ratio of cyclically dry/wet testing, i.e. drying in atmosphere of (55±5)% humidity and wetting in 120 mmol/L NH₄H₂PO₄ solution at an external temperature of (25±2) ℃, on the electrochemical corrosion behavior of 2Cr-1Ni-1.2Mo-0.2V and 2Cr-4Ni-0.4Mo-0.1V steels respectively were investigated by laser scanning confocal microscopy (CLSM), X-ray polycrystalline diffractometer (XRD), X-ray photoelectron spectroscope (XPS), open circuit potential and electrochemical impedance spectroscope. The results show that after tested for 21 d with dry/wet ratio of 0, 1/3, 1 and 3 respectively, uniform corrosion and pitting corrosion emerged for the two steels. With the increase of dry/wet ratio, the corrosion rate and the pitting degree of the two steels increased, but the corrosion resistance of 2Cr-1Ni-1.2Mo-0.2V steel was better than 2Cr-4Ni-0.4Mo-0.1V steel. The corrosion product film of the two steels composed mainly of Fe₃(PO₄)₂, FePO₄, Fe₂O₃, and FeOOH. However, with the increasing dry/wet ratio, the amount of Fe₃(PO₄)₂ and FeOOH decreased, that of Fe₂O₃increased in the corrosion product film. Meanwhile, the open circuit potential and charge-transfer resistance decreased, it is worth pointing out in particular that the corrosion rate of 2Cr-1Ni-1.2Mo-0.2V steel exhibited corrosion rate smaller than 2Cr-4Ni-0.4Mo-0.1V steel.

Key words： CrNiMoV steel NH₄H₂PO₄ drying/wetting cycle dry/wet ratio corrosion

收稿日期: 2021-11-26

ZTFLH:

TG174

作者简介: 王通,男,1995年生,硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2021.340 或 https://www.jcscp.org/CN/Y2022/V42/I6/948

图1 1R钢和2R钢的腐蚀速率随干湿比的变化

图2 1R钢和2R钢在不同浸泡条件实验21 d后的腐蚀产物形貌

表1 在1R钢和2R在不同浸泡条件实验21 d后的表面粗糙度及表面积比参数

图3 1R和2R钢在不同浸泡条件实验21 d除锈后的腐蚀产物形貌

图4 1R钢和2R钢在不同浸泡条件实验21 d后的腐蚀坑三维形貌

图5 1R钢和2R钢在不同浸泡条件实验后的腐蚀坑的孔径及孔深

图6 1R钢和2R钢在不同浸泡条件实验后的腐蚀产物XRD谱图

图7 1R钢和2R钢在干湿比为1/3条件下形成的腐蚀产物膜的XPS谱图

表2 腐蚀产物膜中主要组成相的结合能

表3 腐蚀产物膜中Fe 2p3/2、Cr 2p3/2的XPS谱图拟合出的各峰面积及其面积比

图8 1R钢和2R钢在不同浸泡条件实验21 d后的开路电位

图9 1R钢和2R钢在不同浸泡条件实验21 d后的电化学阻抗谱

图10 1R钢和2R钢在不同浸泡条件实验21 d后的等效电路

Steel	Condition	R_s / Ω·cm²	Q_f		R_f / Ω·cm²	Q_dl		R_ct / Ω·cm²
Steel	Condition	R_s / Ω·cm²	Y₀ / Ω^-1·cm^-2·S ⁿ	$n$	R_f / Ω·cm²	Y₀ / Ω^-1·cm^-2·S ⁿ	n	R_ct / Ω·cm²
1R	Dry/wet=0	80.36	3.19 $×$ 10^-5	0.31	118.2	5.1 $×$ 10^-4	0.52	861.9
	Dry/wet=1/3	81.03	2.33 $×$ 10^-7	0.62	93.03	7.08 $×$ 10^-4	0.57	585.6
	Dry/wet=1	80.93	3.26 $×$ 10^-6	0.74	18.11	7.86 $×$ 10^-4	0.57	539
	Dry/wet=3	79.4	4.7 $×$ 10^-4	0.76	20.57	6.29 $×$ 10^-4	0.74	181
2R	Dry/wet=0	85.09	4.76 $×$ 10^-4	0.65	224.7	5.76 $×$ 10^-4	0.91	455.7
	Dry/wet=1/3	86.58	3.24 $×$ 10^-4	0.73	160.3	3.39 $×$ 10^-4	0.92	297.2
	Dry/wet=1	85.51	3.64 $×$ 10^-4	0.77	132	3.81 $×$ 10^-4	0.90	262.4
	Dry/wet=3	82.65	6.02 $×$ 10^-4	0.76	120.3	7.14 $×$ 10^-4	0.95	139.1

表4 1R钢和2R钢在不同浸泡条件实验21 d后的电化学阻抗谱参数

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