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Point/Counterpoint:: Corrosion

By Masquitos Davis in Meta
Tue Aug 04, 2015 at 05:49:28 PM EST
Tags: (all tags)


Corrosion can be defined as the deterioration of materials by chemical processes. Of these, the most important by far is electrochemical corrosion of metals, in which the oxidation process M → M+ + e- is facilitated by the presence of a suitable electron acceptor, sometimes referred to in corrosion science as a depolarizer.

In a sense, corrosion can be viewed as the spontaneous return of metals to their ores; the huge quantities of energy that were consumed in mining, refining, and manufacturing metals into useful objects is dissipated by a variety of different routes.

The economic aspects of corrosion are far greater than most people realize; according to a 2001 report, the cost of corrosion in the U.S. alone was $276 billion per year. Of this, about $121 billion was spent to control corrosion, leaving the difference of $155 billion as the net loss to the economy. Utilities, especially drinking water and sewer systems, suffer the largest economic impact, with motor vehicles and transportation being a close second.

The special characteristic of most corrosion processes is that the oxidation and reduction steps occur at separate locations on the metal. This is possible because metals are conductive, so the electrons can flow through the metal from the anodic to the cathodic regions. The presence of water is necessary in order to transport ions to and from the metal, but a thin film of adsorbed moisture can be sufficient.

A corrosion system can be regarded as a short-circuited electrochemical cell in which the anodic process is something like

Fe(s) → Fe2+(aq) + 2 e-

and the cathodic steps can be any of

O2 + 2 H2O + 4e- → 4 OH-

H+ + e- → ½ H2(g)

M2+ + 2 e- → M(s)

where M is a metal.



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Point/Counterpoint:: Corrosion | 4 comments (4 topical, editorial, 0 hidden)
counterpoint is too tiny $ (3.00 / 3) (#1)
by sye on Mon Aug 03, 2015 at 07:56:21 AM EST

commentary - For a better sye@K5
ripple me ~~> ~allthingsgo: gateway to Garden of Perfect Brightess in CNY/BTC/LTC/DRK
rubbing u ~~> ~procrasti: getaway to HE'LL
Hey! at least he was in a stable relationship. - procrasti
enter K5 via Blastar.in

Here's the thing y'all (3.00 / 4) (#2)
by HackerCracker on Mon Aug 03, 2015 at 08:31:53 AM EST

If anything is going to make front page these days, you have to write comments *and* (3) them all, otherwise this story is going to end up in K5's database limbo with all the rest.

Get crackin'!

Incredibly informative. (3.00 / 2) (#3)
by modus on Tue Aug 04, 2015 at 05:50:02 PM EST

This comment is 3-worthy.

counter punch - I've totally forgotten my prank (none / 0) (#4)
by sye on Fri Aug 07, 2015 at 09:40:20 AM EST

did I  do that?

no wonder I received three letters from East European country billing me for international trademark protection in exchange of $2500 - 2900 last week.  I was wondering what's with THAT ?  Shouldn't rusty be spammed instead of  SYE@K5 ...

talking about redemption. I need a plan for teleporting my train of thoughts to the Emperor who has no cloths nor growth  

commentary - For a better sye@K5
ripple me ~~> ~allthingsgo: gateway to Garden of Perfect Brightess in CNY/BTC/LTC/DRK
rubbing u ~~> ~procrasti: getaway to HE'LL
Hey! at least he was in a stable relationship. - procrasti
enter K5 via Blastar.in

Point/Counterpoint:: Corrosion | 4 comments (4 topical, 0 editorial, 0 hidden)
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