Anti-Corrosion Performance of Magnesium Potassium Phosphate Cement Coating on Steel Reinforcement: The Effect of Boric Acid.

It has recently been found that magnesium potassium phosphate cement (MKPC) paste coating applied on the surface of steel reinforcement can effectively retard the onset of corrosion and suppress corrosion reactions. However, the fast-setting nature of MKPC-which is a merit in repair-can be problematic in a practical engineering process of coating the steel reinforcement with MKPC paste. To address this problem, boric acid (HBO) was added as a retarder in an MKPC formulation to prolong the setting time.