热轧皮对钢筋预钝化性能的影响

doi:10.11902/1005.4537.2014.114

中国腐蚀与防护学报

2015, Vol. 35

Issue (4): 359-364 DOI: 10.11902/1005.4537.2014.114

本期目录 | 过刊浏览

热轧皮对钢筋预钝化性能的影响

李源晋,路新瀛(

)

Influence of Mill Scale on Prepassivation of Rebar

Yuanjin LI,Xinying LU(

)

Department of Civil Engineering, Tsinghua University, Beijing 100084, China

全文: PDF(2970 KB) HTML

摘要:

采用模拟混凝土孔溶液及饱和Ca(OH)₂溶液对带热轧皮钢筋和光亮钢筋进行预钝化处理,并用人造雨水检验了预钝化钢筋的耐蚀性。结果表明：光亮钢筋和带热轧皮钢筋在模拟混凝土孔溶液及饱和Ca(OH)₂溶液中均具有可钝化性,但热轧皮的存在显著降低了钢筋表面保护膜的生成质量。自然浸泡和阳极极化预钝化处理的钢筋均不能抵抗人造雨水24 h的侵蚀,带热轧皮钢筋的腐蚀速率明显高于光亮钢筋的腐蚀速率。

关键词 ：钢筋, 热轧皮, 预钝化, 腐蚀

Abstract：

Rebar with and without hot-rolled was prepassivated by immersion in a simulated concrete pore solution or saturated calcium hydroxide solution, as well as anodic polarization. The corrosion resistance of the pretreated rebar was examined by immersion in an artificial rain water for 24 h. The results show that the polished rebar and the rebar with hot-rolled could both be passivated in the two type alkali solutions mentioned above, but the hot-rolled could remarkably reduce the protective performance of the passive films formed on the rebar, and promote the corrosion of rebar in the artificial rain water. All the rebar prepassivated by immersion in the two solutions or anodic polarization in the present work are not able to stand against the corrosion attack of the simulated rainwater for 24 h.

Key words： rebar hot-rolled pre-passivation corrosion

基金资助:北京市自然科学基金项目 (2122028) 资助

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引用本文:

李源晋,路新瀛. 热轧皮对钢筋预钝化性能的影响[J]. 中国腐蚀与防护学报, 2015, 35(4): 359-364.
Yuanjin LI, Xinying LU. Influence of Mill Scale on Prepassivation of Rebar. Journal of Chinese Society for Corrosion and protection, 2015, 35(4): 359-364.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.114 或 https://www.jcscp.org/CN/Y2015/V35/I4/359

图1 试样在模拟砼孔溶液, 饱和Ca(OH)2溶液和人造雨水中的极化曲线

表1 钢筋自腐蚀电位和电流密度

图2 光亮钢筋线性极化曲线

图3 模拟混凝土孔溶液中钢筋线性极化电阻随时间变化曲线

图4 两种钢筋样品在饱和Ca(OH)2溶液中线性极化电阻随时间变化曲线

图5 带轧皮钢筋在饱和Ca(OH)2溶液中预钝化24和120 h后的截面形貌及EDS线扫描分析

图6 模拟砼孔溶液预钝化钢筋在人造雨水中浸泡24 h后的线性极化电阻变化

图7 饱和Ca(OH)2溶液预钝化钢筋在人造雨水中浸泡24 h后的线性极化电阻变化

图8 饱和Ca(OH)2溶液预钝化带轧皮钢筋及光亮钢筋在人造雨水中腐蚀后的腐蚀形貌

图9 阳极预钝化钢筋在腐蚀24 h过程中的线性极化电阻变化

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