Development Of Coating Maerials For Metal Decks With Good Wear And Corrosion Resistance

Seawater is one kind of highly corrosive electrolyte. In the recent years, many countries make efforts to prevent marine metal material corrosion. In China, the research in this area falls behind, especially in severely corrosive ocean environment. To solve the problem that how to protect steel material, we still need to do a lot of research and improvement.Coating manufacture, a modern industrial category, develops fast with the rapid development of polymer materials industry. The commonly used coating materials include ipoxy resin coating, ceramic coating, silicone coating and so on. The main film-forming material for silicone coating is a silicone polymer or silicone codified polymer. The sol-gel reaction take place among the main monomers in acidic or alkaline conditions. With this technique coatings are coated on the metal material surface to shield the corrosive media. By taking advantage of good adhesion property, hardness, wear and corrosion resistance of this material, metal materials used in ocean environment will be protected.In this thesis, MTMS is the main components of coating. By changing different reaction conditions, we can explore the consequence of coating performances. The main content shows below:(1)MTMS hydrolysis in acidic condition and generates silanol. The Si—O—Si net structure is synthesized by the reaction of allyl among Si—OH or Si—OH and methyl. The change of conductivity and temperature show the degree of hydrolysis and condensation. The rate of hydrolysis and condensation is faster with less pH. The reaction system with the catalysis of phosphoric acid and formic acid is stable. On the contrary, hydrochloric acid and acetic acid are not good for the system. The siloxane hydrolysis reaction rate is led to different result by different structures of organic groups. The reaction rate of MTMS is faster than MTES in the same condition.(2)With sol-gel method, MTMS as the main component is reacted for 4 hours and coated on the metal surface. The samples will be dried for 15 mins, at 100℃ and 200℃ respectively. The test consequence shows that with increasing alkaline silica sol A mass fraction, the viscosity of coating increases first and then decreases. The solid content of system, hardness and adhesion increases. The viscosity of coating catalyzed by hydrochloric acid is much higher than other kinds of catalyst. The solid content is roughly the same. The coating hardness and adhesion is better than the coating catalyzed by hydrochloric acid. The viscosity of coatings with different pigments is roughly the same. The solid content is higher than the coatings without pigments. The coating hardness is 9H. The adhesion of coatings with kaolin and silicon whisker is better than titanium dioxide. The coating surface, which A/B mass ratios is 5:5, is compact and smooth without cracks on the surface. The surface of coating catalyzed by formic acid and acetic acid is uniform and dense without obvious cracks. With kaolin and silicon whisker as fillers for coating, the surface is smooth and uniform without cracks.(3)The wear resistance of the coating which A/B mass ratio is 5:5 is the best. The wear resistance of the coating catalyzed by formic acid is the best. The hydrochloric one is the worst. The performance of three fillers is roughly the same. The wear resistance of coating with kaolin pigment is relatively good. As for different A/B mass ratios, the corrosion resistance of coatings with 5:5 and 4:6 formulations is relatively good. The corrosion resistance of coating catalyzed by formic acid is the best, but phosphoric acid one is the worst. With whisker silicon as the pigment, the corrosion resistance of the coating is the best.