| Corrosion protection of metallic materials has long been an important research topic to avoid economic losses.However,because of the imperfect nature of the corrosion behavior,only similar physical barriers or chemical protection methods can slow down the corrosion rate.In recent years,as the research on graphene oxide(GO)has intensified,it has been found that the excellent physical structure of GO can act as a particular barrier.To improve the anticorrosion performance of GO,GO is usually compounded with some conductive polymers to full use the lamellar structure of GO and the excellent electrical properties of conductive polymers to improve the corrosion protection of metals.However,differences in the preparation process of GO lead to differences in its performance,especially for water-based coatings where the remaining micropores after solvent evaporation are not conducive to corrosion protection.Therefore,the paper discusses improving its corrosion performance by chemical and photochemical methods based on GO/PANI,respectively.Firstly,the GO and PANI in GO/PANI composites were analyzed for quality screening.Depending on the time of the GO preparation method's oxidation stage,the most suitable GO for GO/PANI composites was selected by particle size analysis(24,3).The effect of different doping ratios and different protonic acid doping on the corrosion performance of GO/PANI was investigated for testing and analysis.The experiments showed that when the GO/PANI filler doping ratio was 1%,compared with 0%,the corrosion protection efficiency increased at 99.2%,and the corrosion potential of GO/PANI-H2SO4 coating was higher with a corrosion voltage of-50 mv and its current density was 8.597×10-7 A/cm2.Second,based on the above,photochemical methods were used to improve the coating's surface structure.The aniline monomer was polymerized on the surface of the coating by modified Ti O2 and tested for corrosion.It was shown that after two days of immersion in a 3.5 wt%Na Cl solution,the Ecorr value of the visible drying(V-composite)coating changed dramatically,reaching a positive 993 m V.Besides,its Icorr value was reduced to 1.993×10-6A/cm2.The composite coating composite of the previous paper the test reference,and it was found that the corrosion rate(CR)of the composite coating was about 5.99 times higher than that of the V-composite coating,which fully shows that the Ti O2 containing the modification can respond to the photopolymerization under visible light and make the coating have higher capabilities.The case of coating light utilization is generally in light curing.The paper prepared a more corrosion-resistant GO/PANI by modifying the coating through photochemical method,which provides an experimental idea for the effective use of light energy in water-based coatings. |
PDF Full Text Request