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公开(公告)号：EP3382062A1
公开(公告)日：2018-10-03
申请号：EP17164327.3
申请日：2017-03-31
申请人： COVENTYA S.p.A.
摘要： The present invention relates to a method for increasing the corrosion resistance of a chrome-plated substrate wherein at least one part of a chrome-plated surface of a chrome-plated substrate is dipped into an electrolyte comprising trivalent chromium ions, at least one conducting salt and at least one reducing agent, and afterwards, a trivalent chromium oxide film is formed on the at least one part of the chrome-plated surface by applying a pulse reverse current between the chrome-plated surface and a counter electrode electrically connected with the chrome-plated surface through the electrolyte. Furthermore, the present invention relates to a chrome-plated substrate obtainable by this method.
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公开(公告)号：EP4051829A1
公开(公告)日：2022-09-07
申请号：EP20796851.2
申请日：2020-10-30
申请人： COVENTYA S.p.A.
IPC分类号： C25D3/06
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公开(公告)号：EP3859053A1
公开(公告)日：2021-08-04
申请号：EP20154909.4
申请日：2020-01-31
申请人： COVENTYA S.p.A.
IPC分类号： C25D3/06
摘要： The present invention refers to an electroplating bath for electroplating a chromium or chromium alloy layer, the bath comprising trivalent chromium ions, organic carboxylic acid, sulfate ions, sodium conductive ions, and additives in the form of inorganic sulfur compound and boric acid as well as a process using such an electroplating bath.
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