DIAGNOSIS OF A SOLID-LIQUID REACTION-MECH ANISM USING A SOLID-VAPOR REACTION - APPLICATION TO THE GALVANIZING PROCESS OF STEELS

The interpretation of the Sandelin phenomenon, leading to overthicknes ses of the coating when galvanizing silicon steel, is due to the react ivity of the substrate in the molten zinc. By zinc vapour phase deposi tion, this phenomenon disappears. In fact, during the zinc vapour-subs trate reaction, the first intermetallic compound which forms has a gre ater silicon content than that in the zeta-compound, which precipitate s the first during the classical galvanizing process.