Home |
Search |
Today's Posts |
|
Woodworking (rec.woodworking) Discussion forum covering all aspects of working with wood. All levels of expertise are encouraged to particiapte. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
|
|||
|
|||
Electrolysis of cast iron?
I've got an idea for mounting a folding extension table off the back of
my table saw which starts with bolting an aluminum angle to the cast iron top. Do I need to worry about electrolysis between the aluminum and the cast iron? |
#2
|
|||
|
|||
"Roy Smith" wrote in message
... I've got an idea for mounting a folding extension table off the back of my table saw which starts with bolting an aluminum angle to the cast iron top. Do I need to worry about electrolysis between the aluminum and the cast iron? I don't think so. First, for galvanic corrosion to take place, there has to be the prescence of an electrolyte, usually water. Second, there's not a large potential difference between cast iron and aluminum alloys. Even if it did happen somehow, since aluminum is less noble than cast iron, the aluminum (aluminium for our friends across the pond) angle would be the anode and would sacrafice itself, so the table saw top would be protected. todd |
#3
|
|||
|
|||
"Todd Fatheree" wrote in message
... "Roy Smith" wrote in message ... I've got an idea for mounting a folding extension table off the back of my table saw which starts with bolting an aluminum angle to the cast iron top. Do I need to worry about electrolysis between the aluminum and the cast iron? I don't think so. First, for galvanic corrosion to take place, there has to be the prescence of an electrolyte, usually water. Second, there's not a large potential difference between cast iron and aluminum alloys. Even if it did happen somehow, since aluminum is less noble than cast iron, the aluminum (aluminium for our friends across the pond) angle would be the anode and would sacrafice itself, so the table saw top would be protected. todd For ordinary thicknesses, ok for years. Environment matters, eg. if near ocean, might be bad if the parts are thin. In dry area, no problem. |
#4
|
|||
|
|||
Roy Smith wrote:
I've got an idea for mounting a folding extension table off the back of my table saw which starts with bolting an aluminum angle to the cast iron top. Do I need to worry about electrolysis between the aluminum and the cast iron? Roy... I've been using the same aluminum [aluminium] insert in my cast iron table top since 1975 and haven't detected any ill effects. It's probably something not much worth worrying about. I recently added an outfeed table to my saw - also starting by attaching an aluminum angle - that you can look over at http://www.iedu.com/DeSoto/outfeed.html. It seems to be surviving fairly well (and will probably outlast me!) -- Morris Dovey DeSoto Solar DeSoto, Iowa USA http://www.iedu.com/DeSoto/solar.html |
#5
|
|||
|
|||
On Tue, 21 Dec 2004 23:04:52 -0500, Roy Smith wrote:
Do I need to worry about electrolysis between the aluminum and the cast iron? Aluminium extrusion is often anodised, which is some of the best electrolytic protection you could get. As to the rest, then if it's going to get wet, then you should worry (there are primers to deal with this). For a saw part in a normal workshop though, it's no problem. -- Smert' spamionam |
#6
|
|||
|
|||
On Tue, 21 Dec 2004 23:04:52 -0500, Roy Smith wrote:
I've got an idea for mounting a folding extension table off the back of my table saw which starts with bolting an aluminum angle to the cast iron top. Do I need to worry about electrolysis between the aluminum and the cast iron? No. But if still worried, use a plastic shim. |
#7
|
|||
|
|||
On Tue, 21 Dec 2004 23:04:52 -0500, Roy Smith wrote:
I've got an idea for mounting a folding extension table off the back of my table saw which starts with bolting an aluminum angle to the cast iron top. Do I need to worry about electrolysis between the aluminum and the cast iron? the big offender is aluminum to copper. if you're worried about it, slip a sheet of paper between. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Wrought Iron, Cast Alum and Cast Iron Decorative welding | Metalworking | |||
Cast Iron sewer -- Is it a hazard? | Home Repair | |||
Cast Iron sewer -- Is it a hazard? | Home Ownership | |||
Bench Vise Questions (Steel vs. Iron) | Metalworking | |||
Replacing cast iron DWV stack pipe | Home Repair |