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400 MPa 级 Cr-Mo 合金化耐蚀钢筋在 氯盐环境下的腐蚀行为
Corrosion Behavior of 400 MPa Cr-Mo Alloyed Corrosion Resistant Rebars in a Chloride Environment
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- DOI:
- 作者:
- 黄吉祥 1 ，李 霈 1 ，袁 静 1 ， 3 ，雷 霆 2 ，阴树标 1
HUANG Jixiang 1 , LI Pei 1 , YUAN Jing 1,3 , LEI Ting 2 , YIN Shubiao 1
- 作者单位:
- 1. 昆明理工大学 冶金与能源工程学院，云南 昆明 650093；2. 昆明冶金高等专科学校 冶金与矿业学院，云南 安宁 650300；3. 新余钢铁股份有限公司，江西 新余 338000
1. Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China; 2. Metallurgy and Mining College, Kunming Metallurgy College, Anning 650300, China; 3. Xinyu Iron & Steel Co., Ltd., Xinyu 338000, China
- 关键词:
- 耐蚀钢筋；氯盐环境；电化学；腐蚀行为
corrosion-resistant rebar; chloride environment; electrochemistry; corrosion behavior
- 摘要:
- 通过周浸腐蚀实验和电化学实验研究了一种 400 MPa 级 Cr-Mo 合金化耐蚀钢筋 HRB400cE 和普通碳素钢筋 HRB400E 在中性氯盐环境中的耐腐蚀性能，利用钨灯丝扫描电镜 (SEM) 和 X 射线衍射 (XRD) 等手段分析了两种钢筋锈层的形貌和组成。 结果显示，在 2%NaCl( 质量分数 ) 溶液中加速腐蚀后， 400 MPa 级 Cr-Mo 合金化耐蚀钢筋相比普通碳素钢筋具有较好的耐氯离子腐蚀能力，腐蚀速率为普通钢筋的 67% 。 普通碳钢经过加速腐蚀后出现疏松结构的较厚锈层，而耐蚀钢筋则是多层致密结构的较薄锈层。 相比 HRB400E 钢筋， HRB400cE 钢筋自腐蚀电位及自腐蚀电流更低，具有较小的电化学腐蚀速率，在不同浓度氯盐环境中体现了良好的耐腐蚀性能。The corrosion resistance of a 400 MPa Cr-Mo alloyed corrosion-resistant HRB400cE steel bar and an ordinary HRB400E carbon steel bar in a neutral chloride environment was studied through weekly immersion corrosion experiments and electrochemical experiments. The morphology and composition of the rebar rust layer were analysed by scanning electron microscopy and X-ray diffraction. The results show that after accelerated corrosion in a 2 wt. %NaCl solution, the new chromium-alloyed corrosion-resistant rebar has better resistance to chloride ion corrosion than ordinary carbon rebar and the corrosion rate in the alternate immersion test is 67% of that of ordinary rebar. After accelerated corrosion, the ordinary carbon rebar exhibits a thicker rust layer with a loose structure, while the chromium-alloyed corrosion-resistant rebar exhibits a thinner rust layer with a multilayer dense structure. Compared to the HRB400 rebar, the HRB400cE rebar has a higher corrosion potential, lower self-corrosion current, and lower electrochemical corrosion rate, exhibiting good corrosion resistance in environments with different chloride concentrations.