Abstract

It is usual to use hydrophilic-coated aluminum foil for evaporator fin of air-conditioners to reduce air flow resistance caused by the water droplets condensed on the fin surface. The major effect of a hydrophilic coating is to reduce the contact angle of the condensate and prevent bridging of the condensate between the adjacent fins. The performance of hydrophilic coating generally tends to be degraded as it is used since the coating material is washed down by the condensate. In the present work, several types of hydrophilic coatings were evaluated in terms of durability of hydrophilicity, corrosion resistance and heat resistance. Results showed that an improved hydrophilic coating of resin type presented superb qualify in terms of durability and corrosion resistance while having almost the same level of qualify in heat resistance compared with the others.

Keywords

• Surface treatment;
• Aluminum foil(;
• Contact angle;
• Hydrophilic coating;
• Durability of hydrophilicity;
• Corrosion resistance;
• Heat resistance

• 표면처리;
• 알루미늄 호일;
• 접촉각;
• 친수코팅;
• 친수지속성;
• 내식성;
• 내열성;