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中国腐蚀与防护学报  2019, Vol. 39 Issue (3): 274-280    DOI: 10.11902/1005.4537.2018.129
  研究报告 本期目录 | 过刊浏览 |
低合金高强度钢的耐模拟工业大气腐蚀行为研究
孙永伟(),钟玉平,王灵水,范芳雄,陈亚涛
中国船舶重工集团公司第七二五研究所 洛阳双瑞特种装备有限公司 洛阳 471000
Corrosion Behavior of Low-alloy High Strength Steels in a Simulated Common SO2-containing Atmosphere
Yongwei SUN(),Yuping ZHONG,Lingshui WANG,Fangxiong FAN,Yatao CHEN
Luoyang Sunrui Special Equipment Co. Ltd., Luoyang Ship Material Research Institute, Luoyang 471000, China
全文: PDF(9715 KB)   HTML
摘要: 

选择Q345E和Cr-Ni-Cu两种典型的低合金高强度钢,在0.052% (质量分数) NaHSO3水溶液中进行极化实验和间浸挂片实验,比较了两种钢的腐蚀速率,评价了两种钢的耐蚀性。利用SEM和XRD分析两种钢的腐蚀形貌,锈层结构及其相组成。结果表明,Q345E和Cr-Ni-Cu钢的腐蚀电位分别为-730和-705 mV;两种钢的腐蚀锈层物相均含有γ-FeO(OH) 和少量的α-Fe,随腐蚀时间延长,存在少量α-FeO(OH) 和Fe3O4。Cr-Ni-Cu钢相比Q345E钢,其腐蚀速率较低,Cr,Ni和Cu等元素的存在提高了其耐蚀性能;Cr-Ni-Cu钢的表面锈层比Q345E钢更加致密,锈层微裂纹更少。

关键词 低合金高强度钢大气腐蚀锈层特征间浸腐蚀腐蚀速率    
Abstract

The corrosion resistance of Q345E and Cr-Ni-Cu steels was comparatively assessed by means of potentiodynamic polarization and cyclic immersion corrosion tests in 0.052% (mass fraction) NaHSO3 solution, which aims to simulate the common SO2-containing atmosphere. The characteristic of corrosion rust was studied by means of scanning electron microscope (SEM) and X-ray diffraction (XRD). Results show that the open circuit corrosion potential of Q345E and Cr-Ni-Cu steel are -730 and -705 mV, respectively. The rust layers of two steels contain γ-FeO(OH) and α-Fe phase. Some α-FeO(OH) and Fe3O4 products generate with increasing of the corrosion time. Compared with Q345E steel, the Cr-Ni-Cu steel has lower corrosion rate due to the formation of a much more compact rust layer containing elements such as Cr, Ni and Cu, which are beneficial to corrosion resistance.

Key wordslow-alloy high strength steel    atmospheric corrosion    rust characteristic    cyclic immersion corrosion    corrosion rate
收稿日期: 2018-09-07     
ZTFLH:  TG142.4  
基金资助:河南省重大科技专项(182102210437)
通讯作者: 孙永伟     E-mail: weiyong09@163.com
Corresponding author: Yongwei SUN     E-mail: weiyong09@163.com
作者简介: 孙永伟,男,1986年生,博士

引用本文:

孙永伟,钟玉平,王灵水,范芳雄,陈亚涛. 低合金高强度钢的耐模拟工业大气腐蚀行为研究[J]. 中国腐蚀与防护学报, 2019, 39(3): 274-280.
Yongwei SUN, Yuping ZHONG, Lingshui WANG, Fangxiong FAN, Yatao CHEN. Corrosion Behavior of Low-alloy High Strength Steels in a Simulated Common SO2-containing Atmosphere. Journal of Chinese Society for Corrosion and protection, 2019, 39(3): 274-280.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2018.129      或      https://www.jcscp.org/CN/Y2019/V39/I3/274

SteelCSiMnPSCrNiCuAlFe
Q345E0.180.251.600.020.0020.030.010.01---Bal.
A0.120.350.800.040.0050.200.250.100.01Bal.
表1  实验钢的化学成分
图1  两种实验钢在0.052%NaHSO3水溶液中的极化曲线
图2  Q345E钢在模拟普通大气环境下的腐蚀深度随时间的变化关系
图3  A钢在模拟普通大气环境下的腐蚀深度随时间的变化关系
图4  Q345E钢和A钢在模拟普通大气环境中腐蚀速率随时间的变化关系
图5  间浸腐蚀96 h后Q345E和A钢锈层表面形貌
图6  间浸腐蚀720 h条件下Q345E和A钢锈层表面形貌
图7  Q345E钢和A钢在间浸腐蚀96 h后的锈层横截面形貌及元素线扫描结果
图8  Q345E钢和A钢在间浸腐蚀720 h后的锈层横截面形貌及元素线扫描结果
图9  实验钢经不同时间间浸腐蚀后表面锈层XRD物相分析结果
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