Black passivation treatment method of steel surface

• Main Authors: LIN, CHAO-SUNG, HSIEH, SHEAU-HWA, LU, CHEN-EN, GER, MING-DER
• Format: Patent
• Language: Chinese; English
• Published: 16.01.2014
• Subjects: APPARATUS THEREFOR; CHEMISTRY; ELECTROFORMING; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; METALLURGY; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS

A black passivation treatment method of a steel surface is described, which includes the following steps. An electroplating bath is provided, in which the electroplating bath includes a chromic acid solution and a blackening agent. An electroplating step is performed on a surface of a steel substrat...