Hardware and Inserts, Dissimilar Metals

[Christian_83]

grease, loctite.

ugga dugga it in without any lube, that way it cant ever become loose.


the hull material being glass will have no change in effect from galvanic corrosion, meaning it will still occur.

carbon is a cathodic material, and aluminum is anodic. that is why aluminum gets eaten up by it.

see chart below:

Yes, it does have a very big diffrence.
Galvanic corrision might occour in a glass hull, with aluminium, riding in say saltwater. But its 10000x times slower.
Have you any first hand experience with this in carbon/glass hulls yourself?
Ive seen it happen so many times. Midshaft housing bein eaten up in carbon hulls in 2 seasons in saltwater. Never happens over 5 years in my stokc glas hull.

Superfreaks ridden in saltwater has aluminum cooling lines eaten up within 4-5 years.

 

[smokeysevin]

I used blue locktite on everything for years in salt but on M8 and smaller it is still pretty risky. I am trying the teflon pipe sealant recommended by y'all on my JS and hoping for the best. The sealant is WAY messier, almost on par with nickle anti-sieze.

Sean

 

[SteveC]

I used blue locktite on everything for years in salt but on M8 and smaller it is still pretty risky.

What risk do you mean, here?

 

[mikesx]

What risk do you mean, here?

I’ve had certain combinations of graded stainless gall with loctite. IMHO it acts more like a sealant ( to keep h2o out) and doesn’t have any lubricant qualities, especially when disassembling bolts that have been set for a while.

 

[smokeysevin]

The smaller fastners are also way more prone to breaking if they corrode into the inserts than say a m8 or m10. M6 will snap the head off no problem.

It is not a comment on loctite, more the fastners. Again, just what I have run into before.

Sean

 

[Pro-pulsion]

Never use red loctite on aluminum threads either, it's meant for mild steel and meant to be a permanent hold as in set it and forget it, no regular disassmbling. It crystalizes when solidified and breaks up into bits when bolts get removed. The hard crystalized bits will tear up the threads in aluminum. One of the national top ultralight aircraft builders up here states this in every course, "anyone that uses red loctite on their aluminum engine and sends it to me for work, it will be sent right back immediately because you have effectively destroyed the integrity of your threads". Just a little something to keep in the back of your thinker before you use red on aluminum threaded parts.

 

[kevbo]

Loctite will soften with heat. Fasteners will come right out of aluminum around 250 degrees.

 

[smoofers]

Never use red loctite on aluminum threads either, it's meant for mild steel and meant to be a permanent hold as in set it and forget it, no regular disassmbling. It crystalizes when solidified and breaks up into bits when bolts get removed. The hard crystalized bits will tear up the threads in aluminum. One of the national top ultralight aircraft builders up here states this in every course, "anyone that uses red loctite on their aluminum engine and sends it to me for work, it will be sent right back immediately because you have effectively destroyed the integrity of your threads". Just a little something to keep in the back of your thinker before you use red on aluminum threaded parts.

In my professional career as an engineer, I consider red loctite only suitable for use on parts that will be deemed scrap if they are disassembled.

 

[88kawi5fiddy]

Yes, it does have a very big diffrence.
Galvanic corrision might occour in a glass hull, with aluminium, riding in say saltwater. But its 10000x times slower.
Have you any first hand experience with this in carbon/glass hulls yourself?
Ive seen it happen so many times. Midshaft housing bein eaten up in carbon hulls in 2 seasons in saltwater. Never happens over 5 years in my stokc glas hull.

Superfreaks ridden in saltwater has aluminum cooling lines eaten up within 4-5 years.

dunno what you are saying, because i indeed stated it still happens in glass hulls and is worse in carbon.

 

[SteveC]

... I would be surprised to see extensive galvanic corrosion (no one I personally know has experienced it, but I'm sure someone will chime in saying they have).

And then a friend points out that a used hull he bought had aluminum tubes and carbon in places he didn't know was carbon... and the tubes were shot upon tearing into the thing. In the end, it was like that before he got it, so no idea what the history was, but it is pretty likely that it was this type of metal loss happening. All it took was me saying I didn't know anyone, and TADA!