- Thread starter ytre
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pedrobedro
Man at Matalan
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Something to do with electrode potential and galvanic corrosion probably ? You can get brass brake unions from suppliers like Namrick.
ytre
Member
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- 379
Just took this off your link. (A very common connection in piping systems is copper and iron/steel. In a connection like this iron/steel will corrode many times faster than iron/steel alone) im surprised they don't insist in mot on brass unions
Exactly the same thing as happens in a torch battery, where the zinc electrode is eaten away as current is drawn.
It can happen with welds made by using stainless filler on mild steel, especially if they are subject to salty conditions, such as by the sea.
One way of countering it is a sacrifial anode, as used on the hulls of ships. A block of zinc or aluminium is eaten away rather than the hull of the ship being eaten away. In France, hot water tanks have a magnesium sacrificial anode which has to be changed every so often.
Car brake pipes are a worked out system which doesn't cause too many problems.
It can happen with welds made by using stainless filler on mild steel, especially if they are subject to salty conditions, such as by the sea.
One way of countering it is a sacrifial anode, as used on the hulls of ships. A block of zinc or aluminium is eaten away rather than the hull of the ship being eaten away. In France, hot water tanks have a magnesium sacrificial anode which has to be changed every so often.
Car brake pipes are a worked out system which doesn't cause too many problems.
