Mn對2205雙相不銹鋼耐點蝕性能的影響

鄭建超; 潘超; 張建濤; 付少鵬; 林平; 胡曉軍

doi:10.13374/j.issn2095-9389.2019.02.012

Mn對2205雙相不銹鋼耐點蝕性能的影響

doi: 10.13374/j.issn2095-9389.2019.02.012

1.
北京科技大學鋼鐵冶金新技術國家重點實驗室北京 100083
2.
瑞浦科技集團有限公司麗水 323903

詳細信息

通訊作者:
胡曉軍, E-mail: huxiaojun@ustb.edu.cn

中圖分類號: TG142.72
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- 文章訪問數: 1068
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- 被引次數: 0
出版歷程
- 收稿日期: 2018-09-13
- 刊出日期: 2019-02-01

Effect of manganese addition on resistance to pitting corrosion of duplex stainless steel S32205

1.
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
2.
Ruipu Technology Co.Ltd., Lishui 323903, China

More Information

Corresponding author: HU Xiao-jun, E-mail: huxiaojun@ustb.edu.cn

摘要

摘要: 研究錳元素對2205雙相不銹鋼耐點蝕性能的影響, 錳質量分數的變化范圍為0. 93%~1. 26%.分別采用化學腐蝕法、動電位極化法研究雙相不銹鋼2205的耐腐蝕性能, 采用夾雜物自動分析技術研究錳對鋼中夾雜物種類及數量的影響, 通過掃描電鏡、能譜及夾雜物原位分析法觀察化學腐蝕及電化學腐蝕前后鋼中夾雜物及其周圍鋼基體的變化情況.采用電感耦合等離子體發光光譜測定腐蝕產物的成分.研究結果表明, 不同類型的夾雜物對耐腐蝕性能的影響不同, (Mn、Si) 氧化物以及(Mn、Si、Cr) 氧硫化物在腐蝕液中更易溶解進而促進腐蝕, 而(Cr、Mn、Al) 氧化物卻很穩定.錳的加入會促進鋼中(Cr、Mn、Al) 夾雜的析出, 此類夾雜物不僅自身很容易被含Cl離子的溶液腐蝕, 而且作為點蝕的起始點, 促進了點蝕坑的形成, 加快了基體腐蝕, 最終導致不銹鋼耐點蝕性能的下降.
- 雙相不銹鋼 /
- 點蝕 /
- 夾雜物 /
- 化學腐蝕 /
- 基體
Abstract: Duplex stainless steel (DSS) has been applied to marine industries, chemical plants, and nuclear facilities because of its high mechanical strength, good weldability, good resistance to pitting corrosion in various aggressive environments, and relatively low cost than similar-performance materials. However, with the decline of iron and steel industries, the competition among stainless steel products is becoming fierce. To reduce the costs of stainless steel, enterprises have attempted to replace high-priced alloy elements with low-priced alloy elements. Thus, the project of substituting manganese for nickel has attracted considerable attention. In this study, effect of manganese addition in the range of 0. 93%-1. 26% on the resistance to pitting corrosion of duplex stainless steel in chloride medium was investigated. Chemical corrosion and potentiodynamic anodic polarization tests were conducted to assess the resistance to pitting corrosion. Categories and number of inclusions were analyzed using inclusion automatic analysis technology. Changes of inclusions before or after chemical and electrochemical corrosion were observed using in situ observation, scanning electron microscope and energy dispersive spectrometer analysis. Inductively coupled plasma test was conducted to analyze compositions of corrosion products. The results indicate that different inclusions have different effects on pitting corrosion. Types of (Mn, Si) oxides and complex inclusions of (Mn, Si, and Cr) oxysulfides are dissolved, which accelerates the corrosion process. However, the types of (Cr, Mn, and Al) oxides are stable in similar environment. The addition of manganese leads to the deterioration of the resistance of dplex stainless steel to pitting corrosion because manganese accelerates the formation of (Mn, Si) oxides that act as initial locations of pitting corrosion in chlorine ion corrosion environment. Dissolved inclusions help to expose fresh matrix to etchant solution, accelerating the corrosion ofthe matrix. Thus, the corrosion of the duplex stainless steel matrix is more serious than that of the inclusions.
- duplex stainless steel /
- pitting corrosion /
- inclusion /
- chemical corrosion /
- matrix

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圖 1 實驗裝置示意圖

Figure 1. Schematic diagram of experimental equipment

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圖 2 Mn的添加對腐蝕率的影響

Figure 2. Effect of manganese addition on the corrosion rate

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圖 3 不同類型夾雜物腐蝕前后形貌變化. (a) (Mn、Si) 氧化物; (2) (Cr、Mn、Al) 氧化物; (3) (Mn、Si、Cr) 氧硫化物

Figure 3. Backscattered electron images of inclusions in experimental alloys before and after chemical corrosion: (a) (Mn, Si) oxides; (b) (Cr, Mn, Al) oxides; (c) (Mn, Si, Cr) oxysulfides

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圖 4 Mn的添加對鋼中各類夾雜物的影響. (a) 數量; (b) 尺寸

Figure 4. Effect of manganese addition on the inclusions: (a) number; (b) size

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圖 5 Mn的添加對(Mn、Si) 氧化物中Mn/Si比值的影響. (a) 樣品1; (2) 樣品2; (3) 樣品3; (4) 樣品4

Figure 5. Effect of manganese addition on the Mn/Si ratio of (Mn, Si) oxides: (a) alloy 1; (2) alloy 2; (3) alloy 3; (4) alloy 4

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圖 6 Mn的添加對鋼基體和夾雜物質量損失的影響

Figure 6. Effect of manganese addition on the mass loss of inclusions and matrix

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圖 7 點蝕機理示意圖. (a) 腐蝕前; (b) 夾雜物的腐蝕; (c) 夾雜物被完全腐蝕; (d) 基體的腐蝕

Figure 7. Schematic diagram of the pitting corrosion mechanism: (a) initial; (b) corrosion process of inclusion; (c) etch off; (d) extension of pitting corrosion

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圖 8 不同Mn含量雙相不銹鋼的動電位極化曲線

Figure 8. Effect of manganese addition on the potentiodynamic polariza-tion behavior of duplex stainless steel

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圖 9 不同類型夾雜物對點蝕的影響. (a) (Mn、Si) 氧化物; (b) (Cr、Mn、Al) 氧化物

Figure 9. Effect of inclusions on pitting corrosion: (a) (Mn, Si) oxides; (b) (Cr, Mn and Al) oxides

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表 1 不同實驗材料的化學成分(質量分數)

Table 1. Chemical compositions of experimental alloys?%

試樣	C	Si	Mn	P	S	Cr	Ni	Mo	Cu	N	Fe	點蝕當量
樣品1	0.018	0.34	0.93	0.025	0.0031	22.47	5.39	3.06	0.15	0.163	余量	35.31
樣品2	0.019	0.32	1.04	0.024	0.0027	22.81	5.30	2.94	0.15	0.168	余量	35.20
樣品3	0.014	0.32	1.16	0.025	0.0033	22.69	5.39	2.85	0.15	0.172	余量	34.85
樣品4	0.015	0.30	1.26	0.024	0.0029	22.72	5.35	2.90	0.15	0.165	余量	34.93

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