ZINC COATING METHOD AND APPARATUS THEREFOR Russian patent published in 2014 - IPC C23C10/36 

FIELD: chemistry.

SUBSTANCE: invention relates to anticorrosive treatment of metal articles and specifically to depositing a zinc coating on articles made of ferromagnetic materials by thermodiffusion zinc coating and an apparatus used to carry out the method. The method includes loading a batch of articles into the retort of an electric heating apparatus, pouring a saturating zinc-containing mixture in amount of 8-16% of the weight of the articles to be zinc coated, which contains 20-25% zinc powder and 75-80% alumina, sealing the retort, placing the retort inside the inductors of the heating apparatus and heating to 350-550°C depending on the required coating thickness and the weight of the articles with eddy currents while rotating the retort to the required temperature, holding the retort, removing the retort from the inductors and cooling while rotating on a process table to a temperature not higher than 250°C. Excess pressure in the retort is continuously released during the coating process. The moment at which the given temperature is reached is monitored, upon which a signal is output for longitudinal displacement of the retort by a value equal to the distance between the inductors. Heating is continued until the given temperature is reached in the displaced areas of the retort while rotating the retort.

EFFECT: high uniformity of heating the surface of the retort, faster zinc coating, high reliability and easy operation of the apparatus for depositing a zinc coating on articles made of ferromagnetic materials via thermodiffusion zinc coating regardless of the length and shape of the article.

4 cl, 5 dwg