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Isolating steel and Ali


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What are people using to isolate different metals to reduce corrosion of dissimilar metals? 

My reading suggests PVC tape - does it need to be anything more than Electrical insulation tape or even gaffer tape?? Or should it be more specialist??

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Aston-Martin - in their 1950s "Superleggera" alloy-over-a-steel-spaceframe - historically used tallow-impregnated hessian.

The 'modern' equivalent is a horribly-slimy thing called "Sylglas" tape, as used by roofers and aklso used to bind-over exposed welded joints on underground oil-pipelines. It's utterly-gross [wear gloves before even looking at it] but is really good at protecting dissimilar-metals joints.

http://www.sylglas.com/products/wptape.htm

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Don't the aviation industry use Zinc Chromate paste / paint on dissimilar metals? Have a feeling they electroplate and/or prime everything with the stuff, it's the manky yellow or green colour you always see naked airframes in.

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8 minutes ago, miketomcat said:

Duralac or tefgel are another option used in the aviation and marine industry.

Mike

Yeah I've used Duralac with some good results so far, a bit sticky to deal with but it appears pretty tough stuff.

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  • 2 weeks later...
2 hours ago, Dr Strangeglove said:

Has anyone used old milk containers. They look strong enough and flexible. Also you tend to have one available every couple of days and nice and easy to cut with scissors.

Close - I've used the clear plastic you get in some pizza box windows the found some clear projector type plastic slide stuff, thems difference, any type of thin tough and non biodegradable plastic should work well. 

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3 minutes ago, Maverik said:

Problem is with rubber based products they perish... quite quickly... tried that too.

Well in that case wellies can't be made of rubber... I've had a piece of welly acting as a gasket on my aircon pump for about 6 years now in the engine bay and still like the first day.

Dad's also had welly cut outs acting as o rings for his 2" pump and most of those are 15+ years old from when they were made. The wellies likely had a few years of use before that.

Admittedly they might be too thick for some applications.

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2 minutes ago, Ed Poore said:

Well in that case wellies can't be made of rubber... I've had a piece of welly acting as a gasket on my aircon pump for about 6 years now in the engine bay and still like the first day.

Dad's also had welly cut outs acting as o rings for his 2" pump and most of those are 15+ years old from when they were made. The wellies likely had a few years of use before that.

Admittedly they might be too thick for some applications.

Depends on the brand of wellies.

 

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