Re: [DIY] Nails

Any sort of galvanized (zinc coating) "protects" iron nails because
the zinc corrodes (oxidizes) first, preventing the oxygen from bonding
with the iron (rust). Once all the zinc has oxidized, then the oxygen
reacts with the iron.

This is the reason boats have replaceable sacrificial anodes.
They get used up. You can't really replace the zinc on your deck nails.

Some other coatings (like Primeguard) depend on a complete
encapsulation of the iron to keep oxygen from reaching the iron.
Any breach, oxygen gets in, iron rusts (and tends to expand
when it rusts), opening a wider breach, more oxygen, more rust, etc.

Blueing (iron) and anodizing (aluminum) is a treatment to form a
surface skin of stable form oxidation that prevents further oxidation
deeper into the metal. Same basic problem as with other coatings.


On 04/04/2013 11:10 AM, subprong wrote:
>
>
> Anyone please correct me if I'm wrong. Anything galvanized will rust
> over time. Most galvanized fasteners are electroplated. Many are hot
> dipped. The hot dipped fasteners are apparently the longer lasting of
> the two (hot dipped fasteners are slightly bigger than standard
> fasteners because of the dipping process...so if you buy a hot dipped
> bolt then you need to get a hot dipped nut for it as a standard nut of
> the same size will be too small).
>
> Stainless steel is the best choice but as you say it's very expensive.
>
> There are Primeguard Plus fasteners (that even come in different
> colors). Of course there are limitations to those as well. If the
> coating is stripped then the fastener is exposed to the elements.
>
> What do you mean by the nails will disappear into the wood? Do you mean
> the nail heads? You can always countersink screw heads into the wood.
> Putty in the holes or get some plastic plugs/caps for the holes.
>
> What kind of shelf boxes are you building. Are they decorative or will
> they need to hold a lot of weight?
>
_


--
Dave Uebele (daveu@sptddog.com)


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