亚硝酸根插层镁铝水滑延缓钢筋锈蚀效果及机理  

The effect and mechanism of NO2-LDH inhibiting the reinforcement corrosion

作　　者：李一帅 宋学锋[1] LI Yishuai;SONG Xuefeng(School of Materials Science and Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,陕西西安710055

出　　处：《新型建筑材料》2024年第8期52-56,共5页New Building Materials

基　　金：陕西省科研攻关项目(2018SF-367)。

摘　　要：以碳酸根型镁铝水滑石为原材料,亚硝酸钠为离子交换剂,通过焙烧还原法制备亚硝酸根插层镁铝水滑石(NO_(2)-LDH),以NO_(2)-LDH为阻锈剂,通过盐水干湿循环与全浸泡实验研究了其对HPB300钢筋的缓蚀效果及缓蚀机理。结果表明:随NO_(2)-LDH掺量的增加,盐水干湿循环下钢筋锈蚀面积明显减少;在全浸泡环境下,NO_(2)-LDH使盐溶液中钢筋长时间处于低、中度锈蚀状态,而未掺NO_(2)-LDH盐溶液中的钢筋则处于高锈蚀状态;NO_(2)-LDH与模拟盐锈蚀溶液中的氯离子发生交换吸附并释放出亚硝酸根,是显著延缓钢筋锈蚀的主要原因。Nitrite intercalation magnesium-aluminum hydrotalcite(NO_(2)-LDH)was prepared by roasting and reduction method with carbonate type magnesium-aluminum hydrotalcite as raw material and sodium nitrite as ion exchanger,taking NO_(2)-LDH as rust inhibitov,its corrosion effect and corrosion mechanism on HPB300 reinforced steel are studied by the saline dry and wet circulation and full soaking experiment.The research results show that:with the increase in NO_(2)-LDH,the corrosion area of the steel corrosion under the dry and wet circulation of the saline water is significantly reduced;in the full immersion environment,NO_(2)-LDH uses the steel bars in the simulated salt corrosion solution for a long time in low and moderate corrosive areas,while the steel bars in the simulation salt corrosion solution are not mixed with NO_(2)-LDH and simulation salt in high corrosion areas;the switching and adsorption of chloride in the corrosive solution and release nitro root is the main reason why NO_(2)-LDH can significantly delay the corrosion of the reinforcement.

关 键 词：钢筋锈蚀 亚硝酸根插层水滑石 离子交换 阻锈剂 

分 类 号：TU528.042.6[建筑科学—建筑技术科学]