An organic-inorganic hybrid sealing agent was fabricated and used in the plasma sprayed Al_(2)O_(3)-13 wt%TiO_(2)coating,and conventional silicone agent was also used for comparison.Protection performance of the coati...An organic-inorganic hybrid sealing agent was fabricated and used in the plasma sprayed Al_(2)O_(3)-13 wt%TiO_(2)coating,and conventional silicone agent was also used for comparison.Protection performance of the coatings was comprehensively evaluated based on both anti-corrosion and anti-biofouling properties.The results reveal that the sealing treatment is remarkably useful to decrease the porosity of the coating,and the porosity of the coating sealed with the hybrid agent is only 0.035%.Immersion corrosion test and Tafel polarization test reveal that the sealed coating with the hybrid agent exhibits a better corrosion resistance by compared with the coating sealed with silicone agent.The corrosion current density i_(corr) of the hybrid agent sealed coating is only 0.7×10^(-6)A·cm^(-2).Moreover,anti-biofouling tests both in the outdoor analogue hydraulic environment and in the natural marine environment prove that the mentioned novel coating presents a better combination of corrosion resistance and anti-biofouling property by compared with the other coatings,and it could be used as a protection of metal components in the marine environment.展开更多
In this work,high-manganese aluminium bronze CuMn_(13)Al_(7)samples were prepared by arc additive manufacturing technology.The phase composition,microstructure,and crystal structure of the high-manganese aluminium bro...In this work,high-manganese aluminium bronze CuMn_(13)Al_(7)samples were prepared by arc additive manufacturing technology.The phase composition,microstructure,and crystal structure of the high-manganese aluminium bronze CuMn_(13)Al_(7)arc additive manufactured samples were analysed using direct-reading spectrometer,metallographic microscope,scanning electron microscope,and transmission electron microscope.The micro-hardness tester,tensile tester,impact tester,and electrochemical workstation were also used to test the performance of the CuMn_(13)Al_(7)samples.By studying the microstructure and properties of the CuMn_(13)Al_(7)samples,it was found that preparation of the samples by the arc additive manufacturing technology ensured good forming quality,almost no defects,and good metallurgical bonding inside the sample.The metallographic structure(α+β+point phase)mainly comprises the following:the metallographic structure in the equiaxed grain region has an obvious grain boundaryα;the metallographic structure in the remelting region has no obvious grain boundaryα;the thermal influence on the metallographic structure produced a weaker grain boundaryαthan the equiaxed grain region.The transverse and longitudinal cross sections of the sample had uniform microhardness distributions,and the average microhardness values were 190.5 HV0.1 and 192.7 HV0.1,respectively.The sample also had excellent mechanical properties:yield strength of 301 MPa,tensile strength of 633 MPa,elongation of 43.5%,reduction of area by 58%,Charpy impact value of 68 J/cm^(2)at–20℃,and dynamic potential polarisation curve test results.Further,it was shown that the average corrosion potential of the sample was–284.5 mV,and the average corrosion current density was 4.1×10–3 mA/cm^(2).展开更多
基金the National Natural Science Foundation of China(No.51379070)the Graduate Research and Innovation Projects of Jiangsu Province(No.KYCX21_0463)。
文摘An organic-inorganic hybrid sealing agent was fabricated and used in the plasma sprayed Al_(2)O_(3)-13 wt%TiO_(2)coating,and conventional silicone agent was also used for comparison.Protection performance of the coatings was comprehensively evaluated based on both anti-corrosion and anti-biofouling properties.The results reveal that the sealing treatment is remarkably useful to decrease the porosity of the coating,and the porosity of the coating sealed with the hybrid agent is only 0.035%.Immersion corrosion test and Tafel polarization test reveal that the sealed coating with the hybrid agent exhibits a better corrosion resistance by compared with the coating sealed with silicone agent.The corrosion current density i_(corr) of the hybrid agent sealed coating is only 0.7×10^(-6)A·cm^(-2).Moreover,anti-biofouling tests both in the outdoor analogue hydraulic environment and in the natural marine environment prove that the mentioned novel coating presents a better combination of corrosion resistance and anti-biofouling property by compared with the other coatings,and it could be used as a protection of metal components in the marine environment.
基金University Synergy Innovation Program of Anhui Province(Grant No.GXXT-2019-022)Anhui Provincial Natural Science Foundation of China(Grant No.1908085QE174)the Talent Program of Anhui Science and Technology University(Grant No.RCYJ201905).
文摘In this work,high-manganese aluminium bronze CuMn_(13)Al_(7)samples were prepared by arc additive manufacturing technology.The phase composition,microstructure,and crystal structure of the high-manganese aluminium bronze CuMn_(13)Al_(7)arc additive manufactured samples were analysed using direct-reading spectrometer,metallographic microscope,scanning electron microscope,and transmission electron microscope.The micro-hardness tester,tensile tester,impact tester,and electrochemical workstation were also used to test the performance of the CuMn_(13)Al_(7)samples.By studying the microstructure and properties of the CuMn_(13)Al_(7)samples,it was found that preparation of the samples by the arc additive manufacturing technology ensured good forming quality,almost no defects,and good metallurgical bonding inside the sample.The metallographic structure(α+β+point phase)mainly comprises the following:the metallographic structure in the equiaxed grain region has an obvious grain boundaryα;the metallographic structure in the remelting region has no obvious grain boundaryα;the thermal influence on the metallographic structure produced a weaker grain boundaryαthan the equiaxed grain region.The transverse and longitudinal cross sections of the sample had uniform microhardness distributions,and the average microhardness values were 190.5 HV0.1 and 192.7 HV0.1,respectively.The sample also had excellent mechanical properties:yield strength of 301 MPa,tensile strength of 633 MPa,elongation of 43.5%,reduction of area by 58%,Charpy impact value of 68 J/cm^(2)at–20℃,and dynamic potential polarisation curve test results.Further,it was shown that the average corrosion potential of the sample was–284.5 mV,and the average corrosion current density was 4.1×10–3 mA/cm^(2).
