Yes, that’s the idea. However, to be it relies on an extremely low resistance in the bonding circuit and all its connections, and on maintenance of the sacrificial anode. If resistance builds up (from corrosion, etc.) and the sacrificial anode wastes away, the corrosion protection will steadily diminish. In particular, the effectiveness of the anode is proportional to its surface area so it needs replacing when it is approximately half gone and not when it is all gone. - Nigel
I would like to know Why no one ever uses Titanium thru hulls? It's our strongest metal, non corrosive, and if you put on a marilyn or trudesign ball valve there'd be no corrosion. I don't think they make a ball valve Yet. And there not much more than a bronze one.
Titanium is expensive and in general we have other ways of avoiding corrosion, such as quality bronze or reinforced plastic. In the racing world, where every ounce of weight matters, there is a significant amount of custom titanium fabrication, although I don’t know about valves, but in the less esoteric and lower budget world in which the rest of us operate there is little to no off-the-shelf availability of titanium products and without some level of scale the cost will always be high. - Nigel
@@BoatHowTo Is it true that stainless steel thru-hull should not be used below the waterline??? As I understand it marine bronze or glass-reinforced nylon composite are the best options of materials to use below the waterline.
@@abelvazquez6012 Unless you use extremely high-grade of stainless steel, it is likely to exhibit pitting corrosion when exposed to salt water over longer periods of time (in particular warm, tropical water). So stainless steel is NOT a suitable material for below-the waterline fittings. High quality bronze or dezincification resistant brass (only if top quality) are much better. But from a corrosion perspective, the ideal option are indeed composite materials like the ones used by trudesign and marelon. - Jan
Very good work and info of you for us all
Great educational video on boat corrosion, sir. Jussojuan
Nigel on my boat, all the sea cocks are bonded to a comon wire tied to the zinc anode. Does that prevent the corrosion issuea on these valves?
Yes, that’s the idea. However, to be it relies on an extremely low resistance in the bonding circuit and all its connections, and on maintenance of the sacrificial anode. If resistance builds up (from corrosion, etc.) and the sacrificial anode wastes away, the corrosion protection will steadily diminish. In particular, the effectiveness of the anode is proportional to its surface area so it needs replacing when it is approximately half gone and not when it is all gone.
- Nigel
I would like to know Why no one ever uses Titanium thru hulls? It's our strongest metal, non corrosive, and if you put on a marilyn or trudesign ball valve there'd be no corrosion. I don't think they make a ball valve Yet. And there not much more than a bronze one.
Titanium is expensive and in general we have other ways of avoiding corrosion, such as quality bronze or reinforced plastic. In the racing world, where every ounce of weight matters, there is a significant amount of custom titanium fabrication, although I don’t know about valves, but in the less esoteric and lower budget world in which the rest of us operate there is little to no off-the-shelf availability of titanium products and without some level of scale the cost will always be high.
- Nigel
@@BoatHowTo Is it true that stainless steel thru-hull should not be used below the waterline??? As I understand it marine bronze or glass-reinforced nylon composite are the best options of materials to use below the waterline.
@@abelvazquez6012 Unless you use extremely high-grade of stainless steel, it is likely to exhibit pitting corrosion when exposed to salt water over longer periods of time (in particular warm, tropical water). So stainless steel is NOT a suitable material for below-the waterline fittings. High quality bronze or dezincification resistant brass (only if top quality) are much better. But from a corrosion perspective, the ideal option are indeed composite materials like the ones used by trudesign and marelon. - Jan