Study of use of hybrid materials obtained by sol-gel to produce efficient pre-treatments to prevent galvanized steel reinforcement corrosion

摘要

This study is focused on the development of OIH coatings for HDGS reinforcement in contact with cementitious media. OIH sol-gel matrices doped and undoped with inhibitors, ureasilicate and alcoholaminosilicate, were synthesized. The coatings were deposited on HDGS by a dipping process. The barrier efficiency of the different OIH sol-gel coatings was studied and assessed by several electrochemical techniques and surface analysis, when in contact with cementitious materials (cement pastes and mortar). The results show that the OIH sol-gel coatings studied effectively allow the mitigation of harmful effects of the initial excessive reaction between cementitious materials and the HDGS, showing promising properties to be used as eco-friendly pre-treatments on HDGS in contact with cementitious media.