CORROSION RESISTANT ALUMINA COATINGS BY FLUI-DIZED BED PROCESS

摘要

Alumina coatings have been deposited on AA 6082 T6 aluminium alloy (table 1) using a novel technique based on a Fluidized Bed (FB). Custom made FB system consisted of a fluidization column, 12 m in height with a square cross section of 400 mm made from stainless steel, a section for air flux homogenization and a porous plate distributor. The air feed was provided by a blower. A flow meter, a hygrometer and a thermocouple set were also used to monitor the process and to assure optimal environmental conditions (Q = 650 m3/h, T = 20 deg C, RH = 40 percent). Aluminum substrates were mounted on a rotating shaft (Rotating speed = 1 Hz).