Huang Jinzhen, Zhu Yangyang, Ma Yuwei, Hu Jie, Huang Haoliang, Wei Jiangxiong, Yu Qijun
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China.
Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang 524006, China.
Materials (Basel). 2021 Sep 23;14(19):5517. doi: 10.3390/ma14195517.
The smart release of healing agents is a key factor determining the inhibition efficiency of microcapsules-based corrosion inhibitors for reinforced concrete. In this study, the release behavior of benzotriazole (BTA) in microcapsule-based inhibitors was investigated in mortar sample to clarify the influence of different hydration products on the release process. The results indicated that under high pH environment (pH > 12.4), only about 5% reserved BTA was released from the mortar sample. pH drop resulted in the increased release of BTA from mortar sample. Most BTA in the microcapsule-based inhibitors was released from mortar sample in low pH environment, which was closely related to morphology/composition alterations of hydration products caused by pH drop of the environment. The smart release of BTA dramatically delayed corrosion initiation of reinforced mortar and halted corrosion product accumulation on the steel surface. Therefore, the corrosion resistance of the reinforced mortar was improved after corrosion initiation.
愈合剂的智能释放是决定基于微胶囊的钢筋混凝土缓蚀剂缓蚀效率的关键因素。在本研究中，研究了苯并三唑（BTA）在基于微胶囊的缓蚀剂中的释放行为，以阐明不同水化产物对释放过程的影响。结果表明，在高pH环境（pH>12.4）下，砂浆样品中仅释放约5%的保留BTA。pH值下降导致BTA从砂浆样品中的释放增加。基于微胶囊的缓蚀剂中的大多数BTA在低pH环境下从砂浆样品中释放，这与环境pH值下降引起的水化产物形态/成分变化密切相关。BTA的智能释放显著延迟了钢筋砂浆的腐蚀起始，并阻止了钢表面腐蚀产物的积累。因此，腐蚀起始后钢筋砂浆的耐蚀性得到了提高。
