TREATMENT OF PHOSPHATE

PURPOSE:To form a fine phosphate film excellent in corrosion resistance by means of a chemical conversion by treatng steel preliminarily with a prescribed aq. surface adjustor soln. and thereafter treating it with a film-chemical conversion treatment soln. consisting of a specified composition contg...

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Bibliographische Detailangaben
Hauptverfasser:	SHIROGANE YOSHIJI, OMI YUKIYOSHI, KAWAKAMI TAKASHI, MATSUDA SHIGEKI
Format:	Patent
Sprache:	eng
Schlagworte:	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 SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	PURPOSE:To form a fine phosphate film excellent in corrosion resistance by means of a chemical conversion by treatng steel preliminarily with a prescribed aq. surface adjustor soln. and thereafter treating it with a film-chemical conversion treatment soln. consisting of a specified composition contg. Zn, PO4 and Fe in the presence of an oxidizing agent. CONSTITUTION:Steel and steel product plated with zinc and zinc alloy are preliminarily treated with the aq. surface adjustor soln. contg. 1-50ppm Ti, 200-3000ppm PO4 and 50-600ppm P2O7 and having 8.0-9.5pH at =5ppm Fe as a chemical conversion promoter and controlling pH of the soln. to 3.3-4.5, steel, steel products are treated in the low-temp. region of 10-40 deg.C. By the above-mentioned treatment, the phosphate film excellent in quality is formed on the surface of the steel or the like by means of the chemical conversion.