The corrosion behavior of 907 steel under thin electrolyte layer(TEL) has been investigated by means of cathodic polarization curve measurement, electrochemical impedance spectroscopy(EIS) and scanning electron micros...The corrosion behavior of 907 steel under thin electrolyte layer(TEL) has been investigated by means of cathodic polarization curve measurement, electrochemical impedance spectroscopy(EIS) and scanning electron microscopy(SEM). The results show that the cathodic diffusion current density presents the variation trend of initial increase and subsequent decrease with the decrease of TEL thickness, and the maximum deposits at 58 μm. The cotangent-hyperbolic impedance(O) is rationally first introduced to study the diffusion process of the reactants through the corrosion products layer with many permeable holes. The initial corrosion rate of 907 steel under different TEL thickness increases with the decrease of TEL thickness except that of 104 μm,whereas the corrosion rate after long time corrosion can be ranked as 104 μm﹥402 μm﹥198 μm﹥301 μm﹥bulk solution.展开更多
Weight-loss trials and potentiodynamic polarization curves have been used to study the inhibitive properties of alkylpolyglucoside (APG) towards the 907 steel in seawater. The inhibition was different, if the length o...Weight-loss trials and potentiodynamic polarization curves have been used to study the inhibitive properties of alkylpolyglucoside (APG) towards the 907 steel in seawater. The inhibition was different, if the length of alkyl chain APG was different. As the result, calcium gluconate, zinc sulfate and APG can protect 907 steel from being corrupted in static seawater. The compound corrosion inhibitor was found to control both the anodic process and the cathodic procesa展开更多
Effect of microstructure on the mechanical properties of a precipitation strengthening Fe-Ni-Co based low expansion alloy,Incoloy 907.has been investigated under different heat treatments.The dispersed γ-phase is fou...Effect of microstructure on the mechanical properties of a precipitation strengthening Fe-Ni-Co based low expansion alloy,Incoloy 907.has been investigated under different heat treatments.The dispersed γ-phase is found to be the principal strengthening phase in the alloy.The microstructure of the alloy with even dispersed fine γ′-phase seems to have the best mechanical properties.However,it will be worsened if the alloy was aged at some higher tem- perature or overaged to precipitate needle-like ε-phase.展开更多
The kinetics of growth of the γ' precipitate in an lncoloy 907 alloy have been studied. The kinetics of particle growth obeyed the tirne law predicted by the Lifshitz-Wagner theory. The distribution of γ'par...The kinetics of growth of the γ' precipitate in an lncoloy 907 alloy have been studied. The kinetics of particle growth obeyed the tirne law predicted by the Lifshitz-Wagner theory. The distribution of γ'particle sizes was found to be significantly broader than the theoretical distribution of LifshitZ-Wagner theory. It is suggested that this is due to the relatively large lattice parameter mismatch between γ' and the Fe-Ni-Co matrix展开更多
基金Projects(21073162,21273199) supported by the National Natural Science Foundation of ChinaProject(GCTKF2012013) supported by the Science and Technology Bureau of Jiaxing Municipality and the State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology,China
文摘The corrosion behavior of 907 steel under thin electrolyte layer(TEL) has been investigated by means of cathodic polarization curve measurement, electrochemical impedance spectroscopy(EIS) and scanning electron microscopy(SEM). The results show that the cathodic diffusion current density presents the variation trend of initial increase and subsequent decrease with the decrease of TEL thickness, and the maximum deposits at 58 μm. The cotangent-hyperbolic impedance(O) is rationally first introduced to study the diffusion process of the reactants through the corrosion products layer with many permeable holes. The initial corrosion rate of 907 steel under different TEL thickness increases with the decrease of TEL thickness except that of 104 μm,whereas the corrosion rate after long time corrosion can be ranked as 104 μm﹥402 μm﹥198 μm﹥301 μm﹥bulk solution.
文摘Weight-loss trials and potentiodynamic polarization curves have been used to study the inhibitive properties of alkylpolyglucoside (APG) towards the 907 steel in seawater. The inhibition was different, if the length of alkyl chain APG was different. As the result, calcium gluconate, zinc sulfate and APG can protect 907 steel from being corrupted in static seawater. The compound corrosion inhibitor was found to control both the anodic process and the cathodic procesa
文摘Effect of microstructure on the mechanical properties of a precipitation strengthening Fe-Ni-Co based low expansion alloy,Incoloy 907.has been investigated under different heat treatments.The dispersed γ-phase is found to be the principal strengthening phase in the alloy.The microstructure of the alloy with even dispersed fine γ′-phase seems to have the best mechanical properties.However,it will be worsened if the alloy was aged at some higher tem- perature or overaged to precipitate needle-like ε-phase.
文摘The kinetics of growth of the γ' precipitate in an lncoloy 907 alloy have been studied. The kinetics of particle growth obeyed the tirne law predicted by the Lifshitz-Wagner theory. The distribution of γ'particle sizes was found to be significantly broader than the theoretical distribution of LifshitZ-Wagner theory. It is suggested that this is due to the relatively large lattice parameter mismatch between γ' and the Fe-Ni-Co matrix
