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Plating nuts and bolts

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Muzzer11/05/2016 12:51:01
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2904 forum posts
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Can't claim to be an expert on the subject but there's an interesting paper linked from the Wikipedia article that seems to be quite relevant.

I know my company had a bad experience in the past with pressed steel components that fractured during fitting as a result of zinc plating without proper precautions. At least the problem doesn't grow during the service life of the part, it's there immediately after manufacture. The Wikipedia article refers to a bridge failure in 2013, despite the mechanism having been understood for over a century, so people are still being bitten by it.

These days, the preferred coating for automotive fasteners is aluminium-zinc flake which is applied as a water-based coating that is then baked on, eg Deltatone. It's far superior to electro zinc in terms of corrosion, looks pretty good and doesn't cause hydrogen embrittlement.

Murray

michael darby22/07/2016 20:32:28
48 forum posts

"Stainless" is not always the answer. it does not suit some applications and not all "stainless " bolts purchased are what you expect to purchase. There is a lot of cr&p out there

Neil Wyatt22/07/2016 20:40:16
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19226 forum posts
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Suggests to me that an hour at gas-mark 6 might be a recipe to please anyone worried about hydrogen embrittlement following electrolytic rust removal.

Neil

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