Corrosion Characteristics of Metallic Coating and Organic Coating in Concrete Accelerated Corrosion Environment

Thermal spraying and high-pressure airless spraying processes were used to prepare Zn-Al-based coatings and nano heavy-duty anti-corrosion organic coatings on the surface of 16MnR steel substrates, respectively, and the corrosion characteristics of the coatings in a accelerated corrosion environment of concrete were also studied. The results showed that the corrosion resistance of Zn coating in Zn-Al ceries coatings was weaker than that of Zn-Al coatings and Al coatings, and the corrosion characteristic was the overall corrosion caused by anode sacrifice. The corrosion of organic coatings mainly resulted from the permeation of corrosive media and the electrochemical reaction of filler Zn powder. The corrosion life of Zn coating and organic coating in the accelerated concrete corrosion environment was estimated:after 180 d in this environment, Zn coating was nearly penetrated, while the organic coating still had a good protective effect on the substrate.