News
What are the basic principles of electroplating?
Release time:
2023-07-05 17:42
Electroplating is an electrochemical process and a redox process. The basic process of electroplating is to immerse the parts in a solution of metal salts as the cathode, and the metal plate as the anode. After connecting to a DC power supply, the required coating is deposited on the parts.
For example: when plating nickel, the cathode is the part to be plated and the anode is a pure nickel plate. The following reactions occur at the cathode and anode respectively:
Cathode (plated parts): Ni2++2e→Ni (main reaction)
2H++e→H2↑(side reaction)
Anode (nickel plate): Ni-2e→Ni2+ (main reaction)
4OH--4e→2H2O+O2+4e (side reaction)
Not all metal ions can be precipitated from aqueous solution. If the side reaction of reducing hydrogen ions to hydrogen on the cathode dominates, it will be difficult for metal ions to precipitate on the cathode. According to experiments, the possibility of electrodeposition of metal ions from aqueous solution can be obtained from the periodic table of elements.
Anodes are divided into soluble anodes and insoluble anodes. Most anodes are soluble anodes corresponding to the coating. For example, zinc plating is a zinc anode, silver plating is a silver anode, and tin-lead alloy plating uses a tin-lead alloy anode. However, a small number of electroplating uses insoluble anodes due to the difficulty in dissolving the anode. For example, acid gold plating uses mostly platinum or titanium anodes. The main salt ions of the plating solution are supplemented by adding the prepared standard gold-containing solution. Chrome plating anodes use pure lead, lead-tin alloy, lead-antimony alloy and other insoluble anodes.
Relevant news
-
Telephone:0769-86857688
Marketing Department:0769-86857688-818
Mobile:13923798157 (Mr. Luo)
Mailbox:lcf@szamt.com -
Mobile:13922878171 (Mr. Yan)
-
Mailbox:yiq@szamt.com
Fax: 0769-86856766
Address: Allmerit Intelligent Industrial Park, No.2 Shaping Road, Keyuan City Information Industrial Park, Tangxia Town, Dongguan City -
WeChat Public Number
Video Number
Copyright©2023 Dongguan Allmerit Technology Co., Ltd. Official Website Copyright
Powered by www.300.cn