takezo
1000+ Head-Fier
- Joined
- Dec 7, 2006
- Posts
- 1,329
- Likes
- 37
here's something i haven't seen on these boards: how do owners of the
sony mdr r10 headphones deal with corrosion from humidity or seashore
conditions? i may be mistaken but it seems sony used magnesium alloy in
fabricating the head band frame. but the weird thing is that there seems to have
been a mistake in using screws dissimilar from the magnesium frame. what does
that mean? using a screw made of iron, nickel or copper to hold the magnesium
frame may lead to galvanic corrosion in the following conditions:
1) two highly electrochemically dissimilar metal present. in this case, the magnesium
alloy and the dissimilar screws.
2) electrically conductive path between the two dissimilar metals. physical
contact must be present.
3) physical path for the anodic metal to send electrons to the cathodic metal.
magnesium has one of the highest anodic indexes known in metallurgy. which
means it's susceptible to galvanic corrosion more readily. and cathodic metals
like Cu, Ni and Fe (ones with the + signs) make things worse
4) humid or saline condition exacerbates the galvanic process. electromotive
force is increased in the cathodic metal pulling the magnesium ions away.
galvanic corrosion is most severe in saltwater environments.
i've been noticing this type of corrosion in several sony r10 near the screws
of the magnesium frame. which led me to wonder if this is a rare and isolated
event or cause for concern for owners living near the seashore or humid
regions. here's a pic of what i'm talking about (pic will self delete in approx.
5 or 6 days):
sony mdr r10 headphones deal with corrosion from humidity or seashore
conditions? i may be mistaken but it seems sony used magnesium alloy in
fabricating the head band frame. but the weird thing is that there seems to have
been a mistake in using screws dissimilar from the magnesium frame. what does
that mean? using a screw made of iron, nickel or copper to hold the magnesium
frame may lead to galvanic corrosion in the following conditions:
1) two highly electrochemically dissimilar metal present. in this case, the magnesium
alloy and the dissimilar screws.
2) electrically conductive path between the two dissimilar metals. physical
contact must be present.
3) physical path for the anodic metal to send electrons to the cathodic metal.
magnesium has one of the highest anodic indexes known in metallurgy. which
means it's susceptible to galvanic corrosion more readily. and cathodic metals
like Cu, Ni and Fe (ones with the + signs) make things worse
4) humid or saline condition exacerbates the galvanic process. electromotive
force is increased in the cathodic metal pulling the magnesium ions away.
galvanic corrosion is most severe in saltwater environments.
i've been noticing this type of corrosion in several sony r10 near the screws
of the magnesium frame. which led me to wonder if this is a rare and isolated
event or cause for concern for owners living near the seashore or humid
regions. here's a pic of what i'm talking about (pic will self delete in approx.
5 or 6 days):