Phosphorization pretreatment method for alloy steel parts

The invention provides a phosphorization pretreatment method for alloy steel parts. The method comprises the steps of part check and acceptance, organic solvent deoiling, sand blasting, organic solvent deoiling, separation, mounting and hanging, alkali degreasing, cold washing and grain refining. Th...

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Bibliographische Detailangaben
Hauptverfasser:	MEI CHANGCHUN, WEN YINGHUI, SU JIANYING, CAI YINGNAN, DAI XIAOLIANG, WANG CHAOLIN, XIAO HONG, CUI YUJING
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS THEREFOR 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 ELECTROFORMING ELECTROLYTIC OR ELECTROPHORETIC PROCESSES 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 PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	The invention provides a phosphorization pretreatment method for alloy steel parts. The method comprises the steps of part check and acceptance, organic solvent deoiling, sand blasting, organic solvent deoiling, separation, mounting and hanging, alkali degreasing, cold washing and grain refining. The method is characterized in that a nitric acid corrosion step is added between the step of mounting and hanging and the step of alkali degreasing, the percentage concentration by weight of a nitric acid corrosion solution is 2%-5%, the corrosion time is 10-30 s, and the temperature of the nitric acid corrosion solution is the room temperature. After the method is used for treating the parts, the surfaces of the phosphorized parts have no bright point or bright area, and a phosphating film is complete and uniform.