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Preparation and corrosion Resistance of Magnesium Coatings by Magnetron Sputtering Deposition

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Journal of Materials Science & Technology 2003年第5期19卷 459-462页

作者： Hongwei HUO, Ying LI and Fuhui WANGstate key laboratory for corrosion and protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China state key laboratory for corrosion and protection Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

Magnesium coatings were fabricated on stainless steel substrates (1Cr11Ni2W2MoV) by a plane magnetron sputtering technique. The argon pressure and the substrate condition (including temperature and the substrate was rotated or fixed) were varied in order to evaluate the influence of the parameters on the crystal orientation and morphology of the coating. The corrosion behavior of the coatings in 1 wt pct NaCI solution was studied by electrochemical methods. The results showed that all coatings exhibited preferred orientation (002) as the argon pressure increased from 0.2 to 0.4 Pa. The morphologies of the coatings varied with the argon pressure and with whether the substrate was rotated or fixed. The open circuit potential of the coatings was more positive than that of cast AZ91D magnesium alloy. However, the immersion test in 1 wt pct NaCI solution showed that the corrosion rates of the coatings were higher than that of cast AZ91D magnesium alloy.

关键词： Magnesium coating corrosion Magnetron sputtering deposition

Research Surveys of Electrochemical Sensors for in-situ Determining Hydrogen in Steels

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Journal of Materials Science & Technology 2000年第3期16卷 305-310页

作者： Gang YU, Xueyuan ZHANG and Yuanlong DU (state key laboratory for corrosion and protection, Institute of corrosion and protection of Metals, Chinese Academy of Sciences, Shenyang 110015, China) state key laboratory for corrosion and protection Institute of Corrosion and Protection of Metals Chinese Academy of Sciences Shenyang 110015 China Applied Chemistry Division of Sciences Institute Shenyang University of Technology Shenyang 110023 China

The principle, construction and application of two types of electrochemical sensors-amperometric and potentiometric are surveyed. Both types of sensors are very sensitive to changes in temperature. The accuracy of hydrogen measurement depends on both the precision of sensors developed and the reliable technique of installation and security of sensors. The two types of sensors have been used for in-situ determining hydrogen permeated in steels owing to a corrosive reaction, a hydrogen gas circumstance at elevated temperatures and high pressure or also a pretreatment process such as pickling and plating process, etc.

关键词： Research Surveys of Electrochemical Sensors for in-situ Determining Hydrogen in Steels NiO

Rare Earth Application in Sealing Anodized Al-Based Metal Matrix Composites

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Journal of Materials Science & Technology 2001年第2期17卷 283-284页

作者： Xingwen YU, Chunan CAO, Chuanwei YAN and Zhiming YAO state key laboratory for corrosion and protection, Institute of corrosion and protection of Metals, Chinese Academy of Science, Shenyang 110015, China Chinese Acad. of Sci. Shenyang 110015 China

A new method for corrosion protection of Al-based metal matrix composites (MMC) was developed using two-step process, which involves anodizing in H2SO4 solution and sealing in rare earth solution. corrosion resistance of the treated surface was evaluated with polarization curves. The results showed that the effect of the protection using rare earth sealing is equivalent to that using chromate sealing for Al6061/SiCp. The rare earth metal salt can be an alternative to the toxic chromate for sealing anodized Al MMC.

关键词： Al Rare Earth Application in Sealing Anodized Al-Based Metal Matrix Composites SiC

Metals Supported Water Monomers:the Bonding Nature Revisited

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Journal of Materials Science & Technology 2010年第2期26卷 97-105页

作者： Jibiao Li, Shenglong Zhu and Fuhui Wang state key laboratory for corrosion and protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China state key laboratory for corrosion and protection Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

A single water monomer is known as a hard-to-observe molecule even in the presence of metal surfaces as supporting matrix. This review highlights effort in experimental characterizations and theoretical modeling of transition metals supported water monomers with attention given to its structure and bonding, together with the insights that we have provided into the bonding nature of the water-interactions by the newly employed projected PDOS （partial density of states） difference analysis, which is proved to be an effective tool to be elucidate such bonding nature. The general s-d hybridization and d-shell effect are summarized, and how these effects can be tuned by tailoring local surface configurations is discussed.

关键词： Water monomer Adsorption Surface bonding Transition metals

Electrochemical corrosion Behavior of Nanocrystalline Materials-a Review

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Journal of Materials Science & Technology 2010年第1期26卷 1-14页

作者： Li Liu, Ying Li and Fuhui Wang state key laboratory for corrosion and protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China state key laboratory for corrosion and protection Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

Nanocrystallization significantly influences the electrochemical corrosion behaviors of metals/alloys in liquid system. In active dissolution, nanocrystallization accelerates the corrosion reactions. If the corrosion products are dissoluble, the corrosion rate is increased by nanocrystallization; if the corrosion products are insoluble, the corrosion rate is decreased on the contrary because the corrosion products act as a block layer to delay the dissolution. In passivation, nanocrystallization changes the composition of the passive film, and results into different morphology and growth process of the passive film, both of which improves the formation of compact film and influences the semiconductor property. It influences the passivation depending on fast element diffusion and special adsorbed ability. The small grain size improves the element diffusion, which leads to the different composition of passive film （passive elements enrichment such as Cr, Ti）. The small grain size also changes the surface condition, which influences the ions adsorption. All increase the corrosion resistance of materials. In local corrosion, nanocrystallization increases the unstable points on the surface of the materials, which increases the possibility of local corrosion. However, the excellent ability of element diffusion helps heal the local corrosion points, which inhibits the growth of the local corrosion.

关键词： Nanocrystalline materials Electrochemical corrosion Review

Relationship between the Brittlement Susceptibility and H Permeation Current for UNS G11180 Steel in 5% NaCl Solution with H_2S

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Journal of Materials Science & Technology 1998年第6期14卷 555-558页

作者： Xueyuan ZHANG and Yuanlong DU(state key Lab. for corrosion and protection, Institute of corrosion and protection of Metals,Chinese Academy of Sciences, Shenyang 110015, China) state key Lab. for corrosion and protection Institute of Corrosion and Protection of Metals Chinese Academy of Sciences Shenyang 110015 China

Sulfide stress corrosion cracking (SSCC) behaviour of UNS G11180 steel in 5% NaCl solution with H2S was studied by slow strain rate tensile test (SSRT), SEM and electrochemical hydro gen permeation technique. The results reveal different cracking mechanism and H permeation current (IH) through UNS G11180 steel plate in different concentration of H2S solution. The susceptibility to SSCC of UNS G11180 Steel in 5% NaCl solution with H2S was evaluated by the permeation current(IH, μA), which depends on the concentration (c×10-6) of H2S by the equation:IH = 8.525 ×c0.7249. lt is proved that the electrochemical H permeation method is a practical way to assess the susceptibility to SSCC.

关键词： UNS NaCl Solution with H2S Relationship between the Brittlement Susceptibility and H Permeation Current for UNS G11180 Steel in 5

Effect of Sputtered TiAlCr Coatings on Oxidation and Hot corrosion Resistance of Ti-24Al-14Nb-3V

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Journal of Materials Science & Technology 2001年第5期17卷 501-506页

作者： Fuhui WANG, Chunhong GUAN, Zhaolin TANG and Weitao WU state key laboratory for corrosion and protection, Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, China Lab. for corrosion and protection Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

The effect of sputtered Ti-50Al-10Cr and Ti-50A1-20Cr coatings on both isothermal and cyclic oxidation resistance at 800-900℃ and hot corrosion resistance at 850℃ of Ti-24Al-14Nb-3V was investigated. Results indicated that Ti-24Al-14Nb-3V alloys exhibited poor oxidation resistance due to the formation of Al2O3+TiO2+AlNbO4 mixed scales in air at 800-900℃ and poor hot corrosion resistance due to the spoliation of scales formed in Na2SO4+K2SO4 melts at 850℃. Both Ti-50Al-10Cr and Ti-50Al-20Cr coatings remarkably improved the oxidation and hot corrosion resistance of Ti-24Al-14Nb-3V alloy.

关键词： Ti Cr Effect of Sputtered TiAlCr Coatings on Oxidation and Hot corrosion Resistance of Ti-24Al-14Nb-3V Al

Oxidation Behaviour of Sputtered Ni-3Cr-20Al Alloy

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Journal of Materials Science & Technology 2000年第1期16卷 88-90页

作者： Guofeng CHEN and Hanyi LOU (state key laboratory for corrosion and protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China) state key laboratory for corrosion and protection Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

The oxidation behavior of sputtered Ni-3Cr-20Al coating at 900℃ in air was investigated. A dense Al2O3 layer was formed on the sputtered Ni-3Cr-20AI coating after 200 h oxidation. However, owing to the segregation of Ni3Al during oxidation process at high temperature, the spinel NiAI2O4 was also formed in the Al2O3 layer. It was found that the formation of NiAI204 had no detrimental effect on the oxidation resistance of the sputtered N?3O-20AI coating due to the excellent adhesion shown by the Al2O3 and NiAl2O4complex oxide scale.

关键词： Al Oxidation Behaviour of Sputtered Ni-3Cr-20Al Alloy Cr Ni

Effect of Potential Perturbation Polarization on the Stress corrosion Cracking of Type 321 Stainless Steel

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Chinese Chemical Letters 1998年第7期9卷 695-696页

作者： Lin NIU Hai Chao LIN Chu Nan CAO (Institute of corrosion and protection of Metals, state key laboratory for Cormsion and protection, Chinese Academy of Sciences, Shenyang 110015) Inst. of Corros./Protect. of Metals State Key Lab. for Corros./Protect. Chinese Academy of Sciences Shenyang 110015 China

The SCC susceptibility of type 321 stainless steel in acidic chloride solution has been studied by slow strain rate testing (SSRT) and SEM. During the slow rate tensile process, the specimen was polarized with different potential perturbation modes such as cyclic potential scan and cyclic potential step methods. The results indicated that the potential scan rate or step frequency played an essential role in the initiation and propagation of crack.

关键词： stress corrosion cracking stainless steel potential perturbation