{"id":1720,"date":"2021-09-17T08:07:27","date_gmt":"2021-09-17T08:07:27","guid":{"rendered":"https:\/\/www.sifcoasc.com\/?p=1720"},"modified":"2023-07-26T14:56:32","modified_gmt":"2023-07-26T14:56:32","slug":"selective-plating-a-simple-way-to-provide-corrosion-protection","status":"publish","type":"post","link":"https:\/\/www.sifcoasc.com\/enuk\/blog\/selective-plating-a-simple-way-to-provide-corrosion-protection","title":{"rendered":"Selective Plating: A Simple Way to Provide Corrosion Protection"},"content":{"rendered":"
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Worn and corroded molds frequently cause downtime for both captive and job shop plastics molders and metal formers.<\/p>\n

In PVC molding, corrosion is commonly caused by hydrocholric acid. Hydrochloric acid is a byproduct generated by incipient decomposition during the molding of polyvinyl chloride, as well as of other polymers. The liberated acid etches or pits the mold cavity. By selectively depositing a thin layer of gold in areas where the acid tends to pocket, the pitting can be eliminated.<\/p>\n

Another common cause of corrosion happens when a mold is out of production and in storage. To prevent the base steel material from corroding while out of service, mild steel molds are frequently selectively plated with cadmium<\/a> while out of production for extended periods of time. Cadmium, because of its position relative to iron in the electromotive force series, will actually form a galvanic cell with the steel and preferentially corrode sacrificially, thus protecting the steel.<\/p>\n

In the next\u00a0blogs<\/a>, you\u2019ll learn about other applications that selective plating is suitable for, including:<\/p>\n