cameronke
Active member
I may have heard that brass and stainless steel are not good combinations in contact in a marine enviroment. Can anybody comment?
regards to all
regards to all
Do brass and stainless steel mix?
- Thread starter cameronke
- Start date
wpsalm
New member
Yes brass and stainless steel are fine together as long as you keep it onboard in an airtight box and never never open it
vyv_cox
Well-known member
Assuming both metals are immersed in seawater, brass is one position higher than active 18/8 stainless in the galvanic series in seawater, so the active 18/8 would tend to corrode preferentially. However, passive 18/8 is a good deal higher than brass, and since in most circumstances the majority would be passive, the brass would corrode preferentially.
However, over-riding that is the fact that brass on its own is not great in seawater and any galvanic effect would tend to make a poor situation worse. Most propellers are made from brass with small additions of tin, connected to a stainless steel shaft. Unless an anode is fitted the corrosion rate of the propeller can sometimes be quite rapid.
However, over-riding that is the fact that brass on its own is not great in seawater and any galvanic effect would tend to make a poor situation worse. Most propellers are made from brass with small additions of tin, connected to a stainless steel shaft. Unless an anode is fitted the corrosion rate of the propeller can sometimes be quite rapid.
snowleopard
Active member
brass no, bronze yes
brass will set up a galvanic cell with itself in sea water, it doesn't need any help from steel!
brass will set up a galvanic cell with itself in sea water, it doesn't need any help from steel!
G
Guest
Guest
Re: brass no, bronze yes
Yes, it's called dezincification, and leaves behind spongy- looking shiny copper. Best seen on folding props that have not had adequate anodic protection. If you think about it, this is why we use zinc alloy for anodes.
Yes, it's called dezincification, and leaves behind spongy- looking shiny copper. Best seen on folding props that have not had adequate anodic protection. If you think about it, this is why we use zinc alloy for anodes.
