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Atmospheric Corrosion of Steel A3 Deposited with Ammonium Sulfate and in the Presence of Sulfur Dioxide 认领 引用 被引量：2
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作者 YeWAN ChuanweiYAN +1 位作者 ChunanCAO JunTAN 《Journal of Materials Science & Technology》 SCIE EI CAS 2003年第5期453-455,共3页
A laboratory study of the atmospheric corrosion of carbon steel deposited with (NH4)2SO4 in the presence of SO2 is reported. The different levels of (NH4)2SO4 (0, 15, 30, 45, 60 μg·cm-2) were added on the surfac... A laboratory study of the atmospheric corrosion of carbon steel deposited with (NH4)2SO4 in the presence of SO2 is reported. The different levels of (NH4)2SO4 (0, 15, 30, 45, 60 μg·cm-2) were added on the surface of the samples before the exposure. The corrosion was investigated by a combination of gravimetry, Fourier transform infrared spectroscope and scanning electron microscopy. A detailed knowledge about the corrosion products was acquired, both quantitatively and qualitatively. The results show that the metal loss increased and the increasing tendency of corrosion rates slowed down with the increasing exposure time. The phase constituents of the corrosion products are mainly α-FeO(OH), γ-FeO(OH), and δ-FeO(OH). 展开更多
关键词 Steel A3 Atmospheric corrosion Deposition Ammonium sulfate Sulfur dioxide
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Influence of NaCl Deposition on Atmospheric Corrosion of A3 Steel 认领 引用 被引量：4
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作者 QingQU ChuanweiYAN 《Journal of Materials Science & Technology》 SCIE EI CAS 2002年第6期552-555,共4页
Regularity of the initial atmospheric corrosion of A3 steel in the presence of NaCI was investigated. The results showed that NaCI can accelerate the corrosion of A3 steel. Dry mass gain of A3 steel in the presence of... Regularity of the initial atmospheric corrosion of A3 steel in the presence of NaCI was investigated. The results showed that NaCI can accelerate the corrosion of A3 steel. Dry mass gain of A3 steel in the presence of NaCI deposition increases with the exposure time, which can be correlated by using exponential decay function. The relationship between dry mass gain and amount of NaCI deposition at a certain exposure time follows a quadratic function. More amount of NaCI deposition will slow down the corrosion rate to some extent after exposure for a certain time. SEM/EDAX was used to characterize the corrosion surface and products. The surfaces of the NaCI treated A3 steel were obviously uneven, and some tiny crevices appear in the corrosion products that could help O2 transmit to the inner layer. The amount of oxygen in atomic percentage in the corrosion products increases with the amount of NaCI deposition. 展开更多
关键词 A3 steel Atmospheric corrosion Corrosion NaCl
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Phase Stability, Kinetic Diagrams and Diffusion Path in High Temperature Oxidation of Binary Solid-Solution Alloys 认领 引用 被引量：2
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作者 YanNIU F.Gesmundo 《Journal of Materials Science & Technology》 SCIE EI CAS 2003年第6期545-552,共8页
The phase diagrams of ternary systems involving two metal components and one oxidant are considered first, the limitations to their use is discussed in relation to the high temperature oxidation of binary alloys. Kine... The phase diagrams of ternary systems involving two metal components and one oxidant are considered first, the limitations to their use is discussed in relation to the high temperature oxidation of binary alloys. Kinetic diagrams, which are useful to predict the conditions for the stability of the two mutually insoluble oxides as the external scale, are then calculated on the basis of thermodynamic and kinetic data concerning both the alloys and the oxides, assuming the validity of the parabolic rate law. A combination of the two types of diagrams provides a more detail information about the oxidation behavior of binary alloys. The calculation of the diffusion paths, which relate the oxidant pressure to the composition of the system in terms of the alloy components both in the alloy and in the scale during an initial stage of the reaction in the presence of the parabolic rate law, is finally developed. 展开更多
关键词 Binary alloys Oxidation Therniodynamic and kinetic diagrams Diffusion path
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Corrosion Behavior of the Rare Earth Sealing Anodized Coating on Aluminum Alloy LY12 认领 引用 被引量：1
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作者 XingwenYU ChuanweiYAN 《Journal of Materials Science & Technology》 SCIE EI CAS 2002年第5期471-474,共4页
Technological process of rare earth sealing anodized LY12 (2024) alloy is introduced. Corrosion behavior of the film was studied by polarization curves and electrochemical impedance spectroscopy (EIS). The results sho... Technological process of rare earth sealing anodized LY12 (2024) alloy is introduced. Corrosion behavior of the film was studied by polarization curves and electrochemical impedance spectroscopy (EIS). The results showed that the coating remained passivity at the potential range from the open circuit potential (-780 mV) to -250 mV in NaCl solution. When the potential exceeded -200 mV, corrosion reaction happened on the coating, the results of EIS analysis was consistent with the results of polarization curves. 展开更多
关键词 LY12 alloy Anodizing Rare earth sealing Corrosion behavior
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Study on the Rare Earth Sealing Procedure of the Porous Film of Anodized 2024 Aluminum Alloy 认领 引用 被引量：1
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作者 XingwenYU ChuanweiYAN 《Journal of Materials Science & Technology》 SCIE EI CAS 2003年第1期51-53,共3页
The rare earth sealing procedure of the porous film of anodized aluminum alloy 2024 was studied with the fieldemission scanning electron microscope (SEM) and X-ray energy dispersive spectroscopy (EDS). The results sho... The rare earth sealing procedure of the porous film of anodized aluminum alloy 2024 was studied with the fieldemission scanning electron microscope (SEM) and X-ray energy dispersive spectroscopy (EDS). The results show thatRE solution can form cerium oxide/hydroxides precipitation in the pores of the anodized coating at the beginning ofsealing. At the same time, the spherical deposits formed on the surface of the anodized coating created a barrierto the precipitation of RE solution in the pores. When the pore-structured anodizing film is covered all with thespherical deposits, RE conversion coating will form on the surface of the anodized coating. The reaction of thecoating formation was investigated by employing cyclic voltammetry. The results indicate that accelerator H2O2 actsas the source of O2 by carrying chemical reaction in course of coating formation. In the mean time, it maybe carrieselectrochemical reaction to generate alkaline condition to accelerate the coating formation. The porous structure ofthe film is beneficial to the precipitation of the cerium hydroxides film. 展开更多
关键词 Rare earth sealing Anodized aluminum alloy Scanning electron microscope Cyclic voltammetry
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Initial corrosion behaviors of AZ91 magnesium alloy in the presence of SO_2 认领 引用 被引量：1
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作者 CuiLin XiaogangLi 《Journal of University of Science and Technology Beijing》 2004年第5期433-441,共9页
The effects of SO_2 on the initial atmospheric corrosion of AZ91D magnesiumalloy were investigated in laboratory. Met-allographic observation, SEM (Scanning ElectronMicroscopy), XRD (X-ray Diffraction) and XPS (X-ray ... The effects of SO_2 on the initial atmospheric corrosion of AZ91D magnesiumalloy were investigated in laboratory. Met-allographic observation, SEM (Scanning ElectronMicroscopy), XRD (X-ray Diffraction) and XPS (X-ray Proton Spectrograph) were used to analyze anddiscuss the initial surface morphology of corrosion layers and corrosion products. The corrosionrate of the alloy increases with increasing the content of SO_2. The initial attack has thecharacteristics of localized corrosion and preferentially concentrates on a phase. MgO and Mg(OH)_2form at first, which provide a protective layer, then the existence of SO_2 decreases the pH of thethin solution on the alloy, accelerates dissolution process, and promotes the formation of MgSO_3centre dot 6H_2O and MgSO_4 centre dot 6H_2O, meanwhile cracks were found on the corrosion productswith corrosion continuation. These soluble corrosion products and the cracks provide the paths forfiltering oxygen and corrosion pollutants into the matrix, which results in severe localizedcorrosion and the loss of protective function of film. 展开更多
关键词 AZ91D magnesium alloy SO_2 initial stages atmospheric corrosion
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STUDY THE INFLUENCE OF H3BO3ON THE ZINC ELECTROPLATING USING ELECTROCHEMICAL NOISE TECHNIQUE 认领 引用
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作者 Z.Zhang C.S.Wu +4 位作者 Q.Y.Cai Y.L.Cheng F.H.Cao J.Q.Zhang C.N.Cao 《Acta Metallurgica Sinica(English Letters)》 EI CAS 2004年第5期661-666,共6页
The influence of H3BO3 on the zinc electroplating was studied using electrochemical noise technique, cyclic voltammetry and steady-state polarization method. The results showed that, under the experimental conditions,... The influence of H3BO3 on the zinc electroplating was studied using electrochemical noise technique, cyclic voltammetry and steady-state polarization method. The results showed that, under the experimental conditions, the deposition of zinc followed the mechanism of two-dimensional nucleation and subsequent grain growth. The addition of H3BO3 into the electroplating solution prominently changes the nucleation and growth kinetics of zinc deposits, which is directly related to the features of electrocrystallization noise and the corresponding structure of the electrodeposits. The results also shown that the electrochemical noise (EN) technique can give more information about the electrodeposits structure and electroplating mechanism than other normal electrochemical measurements can give, such as steady-state polarization method and cyclic voltammetry technique. 展开更多
关键词 zinc electroplating electrochemical noise electrocrystallization
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