Materials and Corrosion

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Online ISSN: 1521-4176

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  1. Protective pre-deposited slurry dip-coating alumina layer on TBC system

    Hesham Abdeldaim and N. El Mahallawy

    Version of Record online: 27 FEB 2017 | DOI: 10.1002/maco.201609265

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    A thin intermediate protective α-alumina layer was pre-deposited by slurry dip-coating technique on APS-CoNiCrAlY bond coat prior depositing APS–YSZ as top coat. The alumina layer acts as barrier for oxygen diffusion to protect the metallic bond coat from excessive oxidation. The new TBC was compared with the standard TBC system which comprises of Ni-superalloy substrate, CoNiCrAlY bond coat and YSZ top coat.

  2. Electrochemical analysis of the ASTM F75 alloy at different pH values and temperatures

    A. I. Kociubczyk, C. M. Méndez, R. W. Gregorutti and A. E. Ares

    Version of Record online: 27 FEB 2017 | DOI: 10.1002/maco.201609394

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    The electrochemical behavior of ASTM F75 alloy was analyzed in a NaCl solution at pH values of 5, 7, and 9 and temperatures of 37 and 42 ºC. The tests were performed in samples corresponding to two different regions of a hip prosthesis. Polarization curves showed that as pH increased the passivity range decreased. The temperature showed no significant effects on the electrochemical behavior of the alloy.

  3. Effect of human albumin on corrosion and biological behavior of CoCrMo

    D. Ionita, F. Golgovici, I. Demetrescu, M. Sajin and G.-R. Pandelea-Dobrovicescu

    Version of Record online: 27 FEB 2017 | DOI: 10.1002/maco.201609406

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    The present paper is an investigation of human albumin effect on corossion and biological behavior of a CoCrMo alloy. The human albumin act as an inhibitor of corrosion reducing corrosion current until five time. Biological tests confirmed non hemocompatibility of CoCrMo alloy and a non trombogenic behaviour. No blood cell shape modification was observed as well.

  4. Nickel-aluminum-bronze/Al2O3 surface nanocomposite produced by friction-stir processing: Corrosion properties and microstructure

    B. Abbasi-Khazaei and S. Keshavarz

    Version of Record online: 24 FEB 2017 | DOI: 10.1002/maco.201609369

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    Friction stir processing was applied for fabricating nanosized particles of Al2O3 as a surface composite layer on nickel-aluminum bronze alloy. In addition, the effect of nanosized Al2O3 on the microstructure, hardness, and corrosion resistance of the alloy surface was investigated. Significant improvement in the corrosion resistance of the alloy surface was observed in the friction stir processed nanocomposite sample.

  5. Entrapment of polyaspartic acid on silica nanoparticle for self-healing coatings

    B. Qian, Z. W. Song, L. Hao and H. Q. Fan

    Version of Record online: 23 FEB 2017 | DOI: 10.1002/maco.201609215

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    The present work studies a self-healing coating based on nanocontainers entrapped polyaspartic acid as corrosion inhibitor. To produce the nanocontainers the layer by layer deposition procedure was used. The results showed excellent anticorrosion performance in self-healing coating, indicating promising practical application in the field of organic coating.

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