METHOD OF PASSIVATION OF EQUIPMENT AND ARTICLES MADE FROM PEARLITE STEELS

• Main Authors: GUSAROV V.I, DOIL'NITSYN V.A, OBLOGIN A.V, PROZOROV V.V, BUKREEV A.N, LYSENKO A.A, SLEPOKON' JU.I
• Format: Patent
• Language: English; Russian
• Published: 10.05.2004
• Edition: 7
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25; NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

FIELD: making of corrosion-resistant coats on equipment and articles made from pearlite steels; corrosion protection of various power equipment; mechanical engineering. SUBSTANCE: proposed method includes treatment in aqueous solution containing 0.01-50 g/l of aluminum nitrate having formula Al(NO3)3-9H2O continued for 1.5-50 h at temperature of 0 to 89 C or 101 to 300 C followed by flushing articles or equipment with aqueous solution of sodium, potassium or ammonium nitrite. EFFECT: improved protective properties of pearlite steels; avoidance of transfer of finely dispersed particles from surface to solution; possibility of performing operations at room temperature. 3 cl, 2 tbl