Author Topic: Solder Mask Question Need Help.  (Read 684 times)

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Offline wade7575Topic starter

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Solder Mask Question Need Help.
« on: September 19, 2019, 05:52:55 am »
I need to get some Solder Mask and I was wondering about the UV Curable stuff and how it works.

I need to refresh some special sharpening stones that use a Copper Tin matrix that hold CBN in place and you use Ferric Chloride to remove some of the Copper Tin.
If you look at the picture I attached to this post you can see the stone is mounted to an aluminum blank and it has laser engraving on it to tell you the grit and I want to protect the blank.

What I was wondering is if the solder mask in the link will stop the Ferric Chloride from harming the aluminum blank,I don't care blank the edge's of the blank if the get muddy looking.

This is the Solder Mask I was looking at getting in the link below,I know about the MG stuff but for the amount I need it's to much money.

What's the best way to clean this stuff off.

https://www.amazon.ca/Solder-Stencil-Flashlight-Paint-Shedding-Storage/dp/B07JFNZYHQ/ref=sr_1_6?keywords=solder%2Bmask&qid=1568869172&s=industrial&sr=1-6&th=1




« Last Edit: September 19, 2019, 06:03:50 am by wade7575 »
 

Offline sleemanj

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Re: Solder Mask Question Need Help.
« Reply #1 on: September 19, 2019, 06:45:51 am »
Soldermask won't be coming off in a hurry without application of an angle grinder, the point is it is largely impervious to damage after all.  Any chemical to strip the soldermask is also going to damage the aluminium I expect.  I don't think that is what you want.

You could maybe use a spray on etch resist, maybe.  Or maybe some latex type sealant or paintable silicone (casting silicone) you could peel off. 

Best way is to remove the stone from the plinth. 
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Offline T3sl4co1l

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Re: Solder Mask Question Need Help.
« Reply #2 on: September 19, 2019, 07:02:42 am »
Why not use nitric acid?  Won't attack the aluminum.

Heh... why indeed, right?  Can get it from chemical suppliers, but if you don't meet their checks, it kinda sucks.  Well, you can make it in-situ with sulfuric acid (drain cleaner?) and a nitrate salt.  Sulfuric won't attack aluminum either, at least not very quickly, but an oxidizer is needed to attack copper.

Also, tin?  What form of tin?  Isn't tin a mask against ferric chloride?

What's wrong with conventional masks like... just regular old grease or paint or tape?

Soldermask is rather tenacious as mentioned above, but a chemical stripper (preferably methylene chloride based?) will remove it without affecting the metals.

I suppose even just good old fashioned heat might work, too.  Unless there's an organic adhesive bond layer in there already.  The supposition is whether anything adverse results (CBN should be stable at red heat, I think?  Aluminum will be annealed though, and may be too soft.)

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Offline wade7575Topic starter

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Re: Solder Mask Question Need Help.
« Reply #3 on: September 19, 2019, 07:12:41 am »
CBN is synthetic diamond but made a bit different but still the the same,CBN when you used on grinding stand up to more heat then natural diamonds,diamonds will get soft and break down at a lower temp then CBN will.

What about the MG Solder mask.
 


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