Method for roughening a metal surface, in particular a cylinder wall of a crankcase

• Main Authors: Wagener, Wolfram, Dr, Bartholomie, Georg
• Format: Patent
• Language: English; French; German
• Published: 06.12.2017
• 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

The method comprises mechanically roughening a metal surface by spraying with a high-pressure liquid jet, where a mixture of water and substance is used as liquid and chemically reacts with the metal surface. The substance is lye and flux, where the lye concentration is 0.001-7% in relation to the mixture and the flux concentration is 0.01-10% in relation to the mixture. The high-pressure liquid jet has a pressure of 1000-2500 bar. After roughening the metal surface, the remaining of the substance added to the liquid is removed from the metal surface with pure water. The method comprises mechanically roughening a metal surface by spraying with a high-pressure liquid jet, where a mixture of water and substance is used as liquid and chemically reacts with the metal surface. The substance is lye and flux, where the lye concentration is 0.001-7% in relation to the mixture and the flux concentration is 0.01-10% in relation to the mixture. The high-pressure liquid jet has a pressure of 1000-2500 bar. After roughening the metal surface, the remaining of the substance added to the liquid is removed from the metal surface with pure water. After mechanical roughening, the flux remains on the roughened metal surface. The metal surface is provided with a surface coating using a thermal coating process after the roughening, where the metal surface passes to a chemical reaction of the flux remaining on the metal surface with the material of the metal surface at a temperature occurring on the metal surface for deoxidation of the metal surface and for oxidative connection between the coating material and the metal surface. The thermal coating process is plasma- or arc wire spraying process. A coloring material is added to the high-pressure liquid jet.