copper - tin - lead corrosion in a pure water environment

[abp]

Hi,

I have an application which requires copper, tin, and lead to coexist in a 100 degree Celsius water enviroment for long periods of time (5 to 20 years life times) without generating non-condensable gases due to corrosion. The application requires that less than 1 gram of water be sealed in a copper container, which uses lead-tin solder to make seals and form joints.

There is also a second very similar application that requires copper, phosphor bronze, lead, and tin to coexist in a 100 degree Celsius environment without producing non condensable gases.

I would appreciate if someone could point out whether these are compatible material sets and if they aren't if there is any conditioning that I can do to the surface of these materials to prevent the formation of non condesable gases. I can not add corrosion inhibitors to the water because that would reduce the surface tension of the water and my application requires the highest possible surface tension.

Thanks.

abp

 

[rustbuster]

Copper, Bronze, and lead (solder) are all very close in the galvanic series. To be certain of the corrosion potential, testing could be done. The chemistry of the water is the most important factor.

 

For corrosion you do need oxygen present, in your application, you will have a small amout of corrosion to take place but once the available oxygen is used, then the corrosion process will stop. If possible to add an oxygen remover to the water, then you would not have any corrosion.