carbon and steel?
05-05-09, 07:00 PM
#1
Member
Thread Starter
Join Date: Apr 2009
Posts: 44
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
carbon and steel?
Is there any problem using a carbon seatpost with a steel frame. I've read that using disimilar metals (alum and steel) can cause them to fuse ... does the same problem exist with carbon?
05-05-09, 07:10 PM
#4
.
Join Date: Aug 2005
Location: Rocket City, No'ala
Posts: 12,763
Bikes: 2014 Trek Domane 5.2, 1985 Pinarello Treviso, 1990 Gardin Shred, 2006 Bianchi San Jose
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 62 Post(s)
Likes: 0
Liked 28 Times
in
13 Posts
Not a problem, carbon is not a metal.
And if you put a little grease on that aluminum seatpost, it won't corrode inside that steel frame. Even so, it's a good idea to yank the seatpost out every year and clean it and apply new grease. Just a thin film.
And if you put a little grease on that aluminum seatpost, it won't corrode inside that steel frame. Even so, it's a good idea to yank the seatpost out every year and clean it and apply new grease. Just a thin film.
05-05-09, 07:16 PM
#5
Senior Member
Join Date: Aug 2008
Posts: 1,025
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
alvanic corrosion is a possible form of deterioration when carbon fiber-reinforced polymer (CFRP) composites and steel are in direct contact in concrete, as in stirrups tied to prestressing CFRP tendons. Laboratory experiments were performed to determine the magnitude of galvanic currents that may take place as a consequence. Preliminary results show little galvanic corrosion of steel (between 10\U-6 to 0.08 μA/cm² of steel current density) when coupled with CFRP composites in mortar free of chlorides with a 0.5 water-to-cement ratio (w/c=0.5). However, significant galvanic action (steel current densities as high as 1.5 μA/cm²) was observed in chloride contaminated mortar. The study suggests that steel corrosion caused by deicing salts or marine exposure may be aggravated by the direct contact between steel and CFRP.
05-05-09, 07:22 PM
#6
Pants are for suckaz
Join Date: Mar 2007
Location: Mt. Airy, MD
Posts: 2,578
Bikes: Hardtail MTB, Fixed gear, and Commuter bike
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
I have a carbon post in my steel framed bike and I've yet to experience any problems.
05-05-09, 07:52 PM
#7
moving target
had a carbon post in ever steel bike I have ever owned with no problem.
05-05-09, 07:57 PM
#8
cab horn
Join Date: Jun 2004
Location: Toronto
Posts: 28,353
Bikes: 1987 Bianchi Campione
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 42 Post(s)
Likes: 0
Liked 26 Times
in
19 Posts
Do not put grease on a carbon post. There are special carbon compounds available for carbon posts that prevent it from seizing into the frame. Trust me, unseizing one from an AL/Steel frame is NOT fun.
