Electroplating pretreatment method for high alloy steel

The invention provides an electroplating pretreatment method for high alloy steel. According to the method, an original pretreatment technological process is not changed, and weak corrosion is improved. The method comprises the steps that 1, the strong oxidizing property of hydrofluoric (HF) acid is...

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Bibliographische Detailangaben
Hauptverfasser:	MEI CHANGCHUN, WEN YINGHUI, SU JIANYING, CAI YINGNAN, DAI XIAOLIANG, WANG CHAOLIN, 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 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
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Beschreibung
Zusammenfassung:	The invention provides an electroplating pretreatment method for high alloy steel. According to the method, an original pretreatment technological process is not changed, and weak corrosion is improved. The method comprises the steps that 1, the strong oxidizing property of hydrofluoric (HF) acid is used for removing silicon compounds and other oxides on the surface of the high alloy steel after parts are subjected to chemical/electrochemical deoiling; and 2, acid pickling time is shortened to 5-10 s from original 0.5-2 min, so that the parts are prevented from being over-corroded by crystal boundary segregation formed by phosphorus and sulphur in part matrix structures due to overlong acid pickling time. Compared with the prior art, by means of the technical scheme, thin and compact oxidation films on the surfaces of the parts can be removed after pretreatment, and therefore the binding force of an electroplating layer and part matrix metal is improved.