不同表面处理方式对300M钢在青岛海洋大气环境下腐蚀行为的影响

doi:10.11902/1005.4537.2019.032

中国腐蚀与防护学报

2019, Vol. 39

Issue (6): 504-510 DOI: 10.11902/1005.4537.2019.032

研究报告

本期目录 | 过刊浏览

不同表面处理方式对300M钢在青岛海洋大气环境下腐蚀行为的影响

赵晋斌¹,赵起越²,陈林恒¹,黄运华²(

),程学群²,李晓刚²

1. 南京钢铁股份有限公司江苏省高端钢铁材料重点实验室南京 211500
2. 北京科技大学腐蚀与防护中心北京 100083

Effect of Different Surface Treatments on Corrosion Behavior of 300M Steel in Qingdao Marine Atmosphere

ZHAO Jinbin¹,ZHAO Qiyue²,CHEN Linheng¹,HUANG Yunhua²(

),CHENG Xuequn²,LI Xiaogang²

1. Jiangsu Key Laboratory for Premium Steel Material, Nanjing Iron & Steel Co. , Ltd. , Nanjing 211500, China
2. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China

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摘要:

在青岛海洋大气环境中对3种不同表面状态的300M钢 (裸材、低氢脆镀镉钛处理、超音速火焰喷涂WC-10Co4Cr) 进行2 a大气暴晒实验，通过表面截面形貌观察、腐蚀产物分析等手段，研究了不同的表面处理方式对300M钢腐蚀行为的影响与机理。结果表明，经2 a大气暴晒后，超音速火焰喷涂WC-10Co4Cr的300M钢喷涂层发生剥落，基体作为阳极与喷涂层间发生电偶腐蚀及缝隙腐蚀，腐蚀速率最快，腐蚀坑最深；低氢脆镀镉钛处理的300M钢表面镀镉钛层腐蚀电位低于基体，镀层优先于基体发生腐蚀，因此对基体保护作用最好，腐蚀速率最低，腐蚀坑最浅。裸材与火焰喷涂层下的腐蚀产物主要由α-FeOOH、β-FeOOH、γ-FeOOH和Fe₃O₄组成，而镀镉钛试样表面除部分钢的腐蚀产物外还有Cd(OH)₂和CdO₂。镀镉钛层由于牺牲阳极作用保护效果最好，超音速火焰喷涂WC-10Co4Cr由于引发电偶腐蚀及缝隙腐蚀，加重了基材的腐蚀。

关键词 ： 300M钢, 低氢脆镀镉钛, 超音速火焰喷涂, 海洋大气腐蚀

Abstract：

Atmospheric exposure of three types of 300M steel with different surface treatments (bare material, Cd-Ti Plating of low hydrogen embrittlement, high-velocity oxygen-fuel (HVOF) sprayed WC-10Co4Cr coating) were conducted for 2 a in Qingdao marine atmosphere. Then the corroded steels were characterized via surface and cross-section morphology observation and corrosion products analysis. The results of the two-year atmospheric exposure test are as follow: the HVOF sprayed WC-10Co4Cr coating peeled off, while galvanic corrosion and crevice corrosion occurred between the coating and the substrate which acted as anode, and the corrosion rate was the fastest and the corresponding corrosion pits were the deepest. While the corrosion potential of the Cd-Ti plated steel was lower than that of the substrate, and the plating was corroded prior to the substrate. The corrosion rate of the plated steel was the slowest and the corresponding corrosion pits were shallow, which indicated that the protective effect of Cd-Ti plating was the best among the three. The corrosion products on the bare steel as well as the substrate beneath the HVOF coating were mainly composed of α-FeOOH, β-FeOOH, γ-FeOOH and Fe₃O₄, but Cd(OH)₂ and CdO₂ were also appeared on the surface of the steel with Cd-Ti plating. The protective effect of Cd-Ti plating was obvious because of sacrificial anode protection, but the HOVF sprayed WC-10Cr4Cr caused galvanic corrosion and crevice corrosion, which aggravated the corrosion of the substrate.

Key words： 300M steel low hydrogen embrittlement Cd-Ti plating high-velocity oxygen-fuel sprayed marine atmospheric corrosion

收稿日期: 2019-03-12

ZTFLH:

TG172

基金资助:国家自然科学基金(51971033);国家重点研发计划(2016YFB0300604);国家材料腐蚀与防护数据中心

通讯作者: 黄运华 E-mail: huangyh@mater.ustb.edu.cn

Corresponding author: Yunhua HUANG E-mail: huangyh@mater.ustb.edu.cn

作者简介: 赵晋斌，男，1980年生，博士生

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引用本文:

赵晋斌,赵起越,陈林恒,黄运华,程学群,李晓刚. 不同表面处理方式对300M钢在青岛海洋大气环境下腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2019, 39(6): 504-510.
Jinbin ZHAO, Qiyue ZHAO, Linheng CHEN, Yunhua HUANG, Xuequn CHENG, Xiaogang LI. Effect of Different Surface Treatments on Corrosion Behavior of 300M Steel in Qingdao Marine Atmosphere. Journal of Chinese Society for Corrosion and protection, 2019, 39(6): 504-510.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.032 或 https://www.jcscp.org/CN/Y2019/V39/I6/504

表1 实验期间团岛环境数据 (实验2 a期间月平均)

图1 不同表面处理300M钢在青岛海洋大气环境下暴晒2 a后宏观形貌

图2 不同表面处理300M钢在青岛海洋大气环境下暴晒2 a后微观形貌

图3 1#试样在青岛海洋大气环境中暴晒2 a的腐蚀产物截面形貌及图3a中A点EDX结果

图4 2#试样在青岛海洋大气环境中暴晒2 a的腐蚀产物截面形貌及图4a中B点EDX结果

图6 3种实验材料在模拟溶液中的开路电位

图5 3#试样在青岛海洋大气环境中暴晒2 a后剥离掉的涂层及剥离涂层后基体腐蚀产物截面形貌及EDX结果

图7 不同表面处理300M钢在青岛海洋大气环境下暴晒2 a后表面锈层的XRD谱

图8 3种不同表面处理的300M钢在青岛海洋大气环境中暴晒2 a的腐蚀坑深度分布图

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