{"id":608,"date":"2021-08-04T12:20:49","date_gmt":"2021-08-04T03:20:49","guid":{"rendered":"http:\/\/160.16.233.38\/?page_id=608"},"modified":"2024-02-29T16:27:22","modified_gmt":"2024-02-29T07:27:22","slug":"chapter04","status":"publish","type":"page","link":"https:\/\/www.uyemura.co.jp\/en\/contents\/story\/chapter04\/","title":{"rendered":"The Story of Plating Chapter4 Plating of Hard Disk Drives"},"content":{"rendered":"
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TOP<\/span><\/a><\/span><\/div>\n<\/div>\n
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\"The<\/a><\/h1>\n

\"When<\/p>\n<\/div>\n<\/header>\n

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\"Episode<\/span><\/h1>\n

The relationship of plating with noble and base metals<\/h2>\n

\"The<\/p>\n

I’m sure you all are familiar with the term, “noble metals.” Well, do you know about “base metals?”
\n“Maybe noble metals are expensive and base metals are cheap?”
\nActually, in this context metals are not classified by their worth! The keyword here is “ionization,” which has a very strong connection with plating. Here, I’ll explain each term:<\/p>\n

Noble metals<\/strong>\uff1aThese metals are stable, show little aging degradation*, and do not easily rust. They are not easily ionized.
\nBase metals<\/strong>\uff1aThese metals rust easily on their own. They are easily ionized.
\n* Aging degradation: A state where the physical properties of a substance change with the passage of time<\/small><\/p>\n

“Ionization tendency” is an indicator used to express the degree of “ionization.” Let me explain in a little more detail.<\/p>\n

“Ionization tendency” expresses how easily oxidation (ionization) occurs in a fluid. In other words,<\/p>\n

The smaller it is<\/strong>\u2026the harder it is for a metal to ionize, oxidize, corrode, and rust
\nThe larger it is<\/strong>\u2026the easier it is for a metal to ionize, oxidize, corrode, and rust<\/p>\n

We call metals that do not ionize easily “noble metals,” while metals that do ionize easily are called “base metals.”<\/p>\n

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Some examples of noble metals are gold, platinum, silver, and copper. Now you understand why they are called “noble metals!” Even so, it seems a bit cruel to call something a “base metal.” After all, it’s not that these metals are inferior…<\/p>\n

Which elements can be used in plating?<\/h2>\n
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