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News > Dynamic industry > Steel material ceramic coating

Steel material ceramic coating

Iron and steel materials for marine work, which is threatened by severe seawater corrosion, and thus causing huge economic losses and safety hazards. In order to improve the corrosion resistance and the preparation of suitable surface coating for protection is very important, the preparation method of plating and organic coating, thermal spraying, which high velocity arc spray coating has an important value, but due to its high porosity limited its application in corrosion resistance. In order to reduce the porosity of the high speed arc spraying coating, the sealing treatment of the coating can be taken.. Closed treatment can improve the coating corrosion resistance and sealant join nano materials or the nano modified can further improve the sealing performance.
Hohai University to improve marine equipment corrosion resistance in sea water by high velocity arc spraying technology for preparing ceramic coating on steel substrate, and the silicone resin sealing treatment, achieved good results, so that the material resistance corrosion performance get greatly improved. Their test takes Q235 steel as the matrix material, the wire material powder core is Fe base alloy and the chromium carbide and so on powder. The Q235 steel was coated with sand blasting except for oil. The arc spraying parameters were: 35 V, current 200 A, pressure 0.65 MPa, spraying distance 200 mm. Is sealed with silicone resin, supplemented by some 6% nano alumina, transparent silicone resin coating to the coating surface, brushing, 3 ~ 5 times, in order to make the full infiltration of the silicone coating and drying at room temperature, curing for 24 hours to make silicone resin and substrate binding stability. The detection shows that the coating is obviously layered and the layer is dense, but the porosity is 6.8%. In the closed process after the sealant curing in the coating of low-lying areas, which greatly reduces the influence of pore defects on the properties of the coating. The hardness of the coating was uniform, the average hardness was about 1040 HV0.1, and the hardness of the matrix was much higher than that of the matrix (170 HV0.1).. The bond strength test showed that all the samples were adhesive and the adhesion strength of the coating was higher than that of the calculated value of 48 MPa, and the coating was well combined with the substrate.. Electrochemical tests show that without the original coating with sealing open circuit potential to decrease slightly, then rises, finally stable at 0.62 V; closed treatment after coating open circuit potential has been relatively stable, at around -0.42 v. Thus, the sealing treatment reduces the sensitivity of the coating to the corrosive medium.. The corrosion potential of the coating is higher than that of the original coating, so the corrosion tendency is lower than that of the original coating.. The corrosion current density of the coating after silicone sealing treatment is smaller than that of the original coating.. After the sealing of the coating, the value of the coating is large, the capacitance is small, and has better insulation property.. The results of these experiments show that the corrosion resistance of the coating after silicone sealing treatment has been greatly improved.. Using arc spraying technology in ceramic coating surface preparation of steel material with high resistance corrosion resistance, but the presence of pore into the solution as well as the chloride ion ingress convenient channel, accelerated the corrosion of the matrix. Silicone resin with low surface energy, hydrophobic insulation, after curing, high bonding strength characteristics, coating after closed treatment, silicone resin to fill the pores blocked the entry of corrosive medium. And active groups in the molecular structure of the silicone, with reaction can and substrate firmly together, formed a layer of non polarity organic groups outside of the hydrophobic membrane, which helped to prevent the infiltration of corrosive medium, to improve the corrosion resistance of the material.

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