MAGNESIUM ALLOY SUBSTRATE, ELECTRONIC APPARATUS, AND FORMATION METHOD OF ANTICORROSIVE COATING SHEET

• Main Authors: KASHIWAKAWA TAKAHIRO, KIMURA KOICHI, NAGANUMA YASUO
• Format: Patent
• Language: English; Japanese
• Published: 15.02.2018
• Subjects: CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; 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; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; METALLURGY; PERFORMING OPERATIONS; PRINTED CIRCUITS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TRANSPORTING

PROBLEM TO BE SOLVED: To improve corrosion resistance of a magnesium alloy substrate furthermore than hitherto, concerning the magnesium alloy substrate, an electronic apparatus, and a formation method of an anticorrosive coating sheet.SOLUTION: A first coating sheet mainly composed of Si and O which are reaction products between sodium silicate and a magnesium alloy is provided on the surface of a substrate comprising the magnesium alloy, and a second coating sheet comprising a reaction product of sodium fluorosilicate mainly composed of Si and F is provided on the surface of the first coating sheet.SELECTED DRAWING: Figure 1 【課題】マグネシウム合金基体、電子機器及び耐食性被膜の形成方法に関し、マグネシウム合金基体の耐食性を従前以上に向上する。【解決手段】マグネシウム合金からなる基体の表面にケイ酸ナトリウムとマグネシウム合金との反応生成物であるＳｉ及びＯを主要成分とする第１の被膜を設け、前記第１の被膜の表面にＳｉ及びＦを主要成分とするフルオロケイ酸ナトリウムの反応生成物からなる第２の被膜を設ける。【選択図】図１