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http://dx.doi.org/10.3740/MRSK.2012.22.12.643

Chemical Evaluation of Corrosion Resistance for Stainless-Steel Plate Wet-Coated by Alumina-Fluoro Composite Coatings  

Jung, Ha-Young (Eco-Composite Materials Center, Korea Institute of Ceramic Engineering & Technology(KICET))
Kim, Dae Sung (Eco-Composite Materials Center, Korea Institute of Ceramic Engineering & Technology(KICET))
Lee, Seung-Ho (Eco-Composite Materials Center, Korea Institute of Ceramic Engineering & Technology(KICET))
Lim, Hyung Mi (Eco-Composite Materials Center, Korea Institute of Ceramic Engineering & Technology(KICET))
Kim, Kun (Semiline Co.)
Jung, Min-Kyu (Semiline Co.)
Publication Information
Korean Journal of Materials Research / v.22, no.12, 2012 , pp. 643-649 More about this Journal
Abstract
Coatings composited with alumina and Perfluoro alkoxyalkane (PFA) resin were deposited on stainless steel plate (SUS304) to further improve corrosion resistance. Plate (ca. $10{\mu}m$) and/or nanosize (27~43 nm) alumina used as inorganic additives were mixed in PFA resin to make alumina-fluoro composite coatings. These coatings were deposited on SUS304 plate with wet spray coating and then the film was cured thermally. According to the amount and ratio of the two kinds of alumina having plate morphology and nano size, corrosion resistance of the film was evaluated under strong acids (HF, HCl) and a strong base (NaOH). The film prepared with the addition of 5~10 wt% alumina powders in PFA resin showed corrosion resistance superior to that of pure PFA resin film. However, for the film prepared with alumina content above 10 wt%, the corrosion resistance did not improve with the physical properties, such as surface hardness and adhesion. The film prepared with plate/nanosize (weight ratio = 1/2) alumina especially enhanced the surface hardness and corrosion resistance. This can be explained as showing that the plate and the nanosize alumina dispersed in PFA resin effectively suppressed the penetration of cations and anions due to the long penetration length and fewer defects that accompany the improved surface hardness under a serious environment of 10% HF solution for over 120 hrs.
Keywords
alumina-fluoro composite; coatings; plate and nanosize alumina; corrosion resistance; HF;
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