METHOD FOR DEPOSITION OF CONVERSION COATING ONTO PARTS MADE FROM ALUMINUM AND ALLOYS THEREOF

摘要

FIELD: process for coating of parts made from aluminum of alloys thereof. ^ SUBSTANCE: method involves preparing part surface for coating process; dipping part into solution of composition including, g/l: orthophophoric acid 40-50, chromic anhydride 5-7, hydrofluoric sodium 3-4, at temperature of 20-30 C; holding in solution during 4-7 min; washing with cold running water and drying. Parts dipped into solution are subjected to harmonic vibrations with fixed frequency ranging between 300 Hz and 600 Hz and mean-square acceleration of 9-11 m/s. ^ EFFECT: provision for producing of thick corrosion-resistant coating on parts made from aluminum and alloys thereof. ^ 3 ex