Subbiah Karthick, Lee Han-Seung, Mandal Soumen, Park Taejoon
Department of Architectural Engineering, Hanyang University, 1271 Sa 3-dong, Sangrok-gu, Ansan, Gyeonggi-do 15588, Republic of Korea.
Intelligent Construction Automation Center, Kyungpook National University, 80, Daehak-ro, Buk-gu, Daegu 41566, Republic of Korea.
ACS Appl Mater Interfaces. 2021 Sep 15;13(36):43676-43695. doi: 10.1021/acsami.1c11994. Epub 2021 Aug 31.
The present study has been focused on the environment-friendly corrosion inhibitor. Conifer cone () has been used as a novel corrosion inhibitor to mitigate the corrosion of steel rebars in simulated concrete pore solutions (SCPS) in the presence and absence of chloride ions. The corrosion inhibitor is extracted by simple chemical methods. The functional groups present in the extracted conifer cone (ECC) powder are characterized as well as the surface morphology of ECC has been examined. The corrosion inhibition performance has been evaluated by the electrochemical and weight loss methods. The experimental results indicate that ECC possesses a corrosion inhibition efficiency of 81.2% at a dosage of 1000 mg·L, after 720 h of immersion in chloride-contaminated SCPS. Adsorption isotherm and their standard Gibbs free energy (Δ) values are calculated by Langmuir, Freundlich, and Temkin isotherm methods, and the results indicate that the ECC is initially adsorbed on the steel rebar surface by physisorption and then it turns to chemisorption. The steel rebar surfaces have been characterized after exposure to the ECC containing SCPS, and the results indicate that the ECC containing cationic adsorbate molecules, which interact with steel rebar, leads to retardation of metal dissolution in corrosive chloride medium.
本研究聚焦于环境友好型缓蚀剂。松果（）已被用作一种新型缓蚀剂，用于在有和没有氯离子存在的情况下，减轻模拟混凝土孔隙溶液（SCPS）中钢筋的腐蚀。该缓蚀剂通过简单的化学方法提取。对提取的松果（ECC）粉末中存在的官能团进行了表征，并对ECC的表面形态进行了检查。通过电化学和失重法评估了缓蚀性能。实验结果表明，在含有氯离子的SCPS中浸泡720小时后，ECC在剂量为1000 mg·L时具有81.2%的缓蚀效率。通过朗缪尔、弗伦德利希和坦金等温线方法计算了吸附等温线及其标准吉布斯自由能（Δ）值，结果表明ECC最初通过物理吸附吸附在钢筋表面，然后转变为化学吸附。在暴露于含有ECC的SCPS后，对钢筋表面进行了表征，结果表明含有阳离子吸附物分子的ECC与钢筋相互作用，导致在腐蚀性氯化物介质中金属溶解的延迟。
