The behavior of corrosion and runoff of A3 steel in artificial rainwater

The effects of pH value of simulated rainwater and rain intensity on corrosion and runoff behavior of A3 steel were studied with a simulating raining system designed and made by ourselves, while the variation of corrosion rate was monitored by ACM. The results show that corrosion rate of A3 steel decreases with pH value of simulated rain increasing. The variation of corrosion rate with pH of simulated rain monitored by ACM is same as the result of that determined by weight loss method, which shows that ACM is practicable to monitor corrosion rate during raining in some way. The runoff quantity of A3 steel decreases and then increases with pH value of simulated rain increasing, which was explained from change of corrosion product. The corrosion rate and runoff quantity of A3 steel increase with intensity of simulated rain increasing. When the rain quantity was same, the runoff quantity increases with intensity increasing, which shows the strike of rain on the surface of A3 steel having an evident influence on its corrosion and runoff behavior.