Electrochemical reaction is caused by the contact of
- bonding.
- moisture on the surface of the metal.
- dissimilar metals.
Explanation from PART66Online
An electrochemical corrosion reaction needs an electrolyte to carry current between anodic and cathodic sites; on an airframe this is supplied by moisture on the metal surface. Dissimilar metals or a bond merely set up or control the potential difference, but without the surface moisture acting as electrolyte the reaction cannot proceed.
L
Leehenson asked · 18 Sep 2016
Wouldn't C be correct as 'electrochemical' corrosion requires a anode and a cathode, where as a 'chemical' corrosion being oxidation would be moisture on the surface of the metal? Please help? Thanks.
Community Comments (5)
P
PART66Online
25 Sep 2016
Hi Leehenson. Two dissimilar metals in contact will initiate galvanic corrosion, not electro-chemical. But metal + some electrolyte = electro-chemical corrosion.
L
Leehenson
25 Sep 2016
Thanks for reply, but I'm still not sure about this question as galvanic corrosion is electrochemical?
R
Rtrump
25 Sep 2016
lee your wrong so pipe down
P
PART66Online
26 Sep 2016
Actually question is not about corrosion, just about reaction. Here is article in britannica which may help: britannica.com/science/electrochemica...
R
rwm1273
11 Oct 2016
Rtrump, if you have no valid explanation to the question, perhaps you should pipe down. Leehenson was asking a valid question which was explained by dimky.
Please Sign In to post a comment.
More discussions in 6. Materials & hardware
- Galvanic action caused by dissimilar metal contact may best be prevented by
- Galvanic action caused by dissimilar metal contact may best be prevented by
- The lifting or flaking of the metal at the surface due to delamination of grain boundaries caused by the pressure of corrosion is
- Intergrannular corrosion in structural aluminium alloy parts
- Surface corrosion on stainless steel is identified by
- Spilled mercury on aluminium