Chankitmunkong, Suwaree

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Preferred name
Chankitmunkong, Suwaree
Alternative Name
Chankitmunkong, S.
Main Affiliation
Email
suwaree.ch@kmitl.ac.th

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    Item type:Publication,
    Characterization of the Anodic Film and Corrosion Resistance of an A535 Aluminum Alloy after Intermetallics Removal by Different Etching Time
    (2022-07-01)
    Chankitmunkong, Suwaree
    ;
    Eskin, Dmitry
    ;
    Limmaneevichitr, Chaowalit
    ;
    Kengkla, Nattarat
    ;
    Diewwanit, Onnjira
    The objective of this study was to improve the corrosion resistance of an A535 alloy by removing intermetallics on the alloy surface by alkaline etching to improve the morphologies and properties of the anodic film that was sealed with different sealants. It was found that alkaline etching for 4 min was suitable for dissolving intermetallic particles and simultaneously providing sufficient roughness for the adhesion of an oxide film to the Al matrix. The effect of alkaline etching revealed that a decrease in the intermetallic fraction from 21% to 16% after etching for 2 and 4 min, respectively, corresponded to the increase in the surface roughness, thickness, and consistency of the anodic film. It was also demonstrated that the surface morphology of the anodic films after stearic acid sealing was more uniform and compact than that after nickel fluoride sealing. The electrochemical polarization curves and salt spray test proved that the alloy etched for 4 min and sealed with stearic acid had better corrosion resistance as compared with the aluminum alloy sealed with nickel fluoride.
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    Item type:Publication,
    Effect of Homogenization on Anodic Film and Electrochemical Behavior of an A535 Alloy After Sealing with Stearic Sealant
    (2022-01-01)
    Chankitmunkong, Suwaree
    ;
    Eskin, Dmitry G.
    ;
    Limmaneevichitr, Chaowalit
    ;
    Pandee, Phromphong
    ;
    Kengkla, Nattarat
    Almag 35 (A535) is a commercial aluminum alloy intended for a number of marine components, which is mainly justified by its excellent castability and corrosion resistance. However, the most important factor for corrosion resistance is the formation of intermetallics that can lead the defects in the oxide film and substrate, as well as activate the corrosion reaction. The characteristics of a sealant on the anodic film were investigated in this work. The alloy was subjected to homogenization at 400 °C for 5 h to improve the uniformity of the anodic oxide film due to the decreased number of intermetallics as a result of dissolving in the matrix. It also improved the hardness of this alloy. Electrochemical measurements were conducted to investigate the corrosion behavior. The effects of intermetallics and stearic sealing on the characteristics of the oxide layer are discussed. The decrease in the number of intermetallics can lead to reduced corrosion current density (I<inf>corr</inf>) and increased potential corrosion (E<inf>corr</inf>), which results in a lower corrosion rate of this alloy.