Oxidization over flex wire - solution

Sorry, one correction in the above information..

Material is not an soldered(SAC 305) coated material , it is an silver coated material.

Is the silver coating oxidize w.r.to change in the environmental factor? Confirm....

Hope to get your valuable feedback as sooner!!!

Hari

The discoloring(tarnishing) of silver plate is caused by a reaction between silver and airborne sulfur compounds. One easy way to prevent it is to put the silver in an airtight bag along with an anti-tarnish strip made by 3M (and others). I have been told that a piece of chalk will also do the same job. The tarnish is unsightly, but does not hurt the properties of the silver plating.

I have to disagree with your last phrase!

In my experience, it is extremely difficult to obtain reliable solder connections to tarnished silver plated wires without thorough cleaning before soldering. This was using ordinary 60/40 solder with rosin flux. I haven't tried it with any of the lead-free solders.

Everyone has different experiences. It depends on the degree of tarnish and the activity of the rosin flux. Non-activated rosin is called "water white" and has minimal tarnish removing qualities. Most rosin flux is activated. The degree of activation and the soldering temperature will determine how well it reduces silver tarnish. YMMV

HI welderman,

Thanks for your valuable input..

Two clarification:

1.what is anti tarnish strip?? Any website ref.

2.How the chalk will protect the silver coated area from tarnishing ? To my knowledge,I think as this absorb the sulphur compounds from air..

Hoping to get your answer....

Hari

Haricool, if you perform a Google search, you will find numerous sources for 3M Tarni-Shield strips. They are inexpensive and provide the corrosion protection you seek. I believe these strips (as well as chaulk) are getters for sulfur compounds in the air. They absorb and trap sulfur compounds much the same way that silica gel absorbs water molecules from the air, making the air dry.