Gold hidden under paint

[Romix]

Many boards have gold hidden underneath the paint.
Any ideas of how to remove paint?
My idea is to remove solder first,then remove base and finally AR. Would it work that way?

 

[rickbb]

Many posts on the subject, use the search function.

 

[Claudie]

Why would someone paint a board? Are you referring to the solder mask, the (usually) green coating? If so, try reading this post: http://goldrefiningforum.com/~goldrefi/phpBB3/viewtopic.php?f=49&t=4831
If you are actually talking about painted boards, maybe try some paint remover. :|

 

[Anonymous]

Many posts on the subject, use the search function.

Have you turned into the forum police lately Rick? Chill out and stop being so harsh on people eh? It's really not needed. The next time you ask a question you'll get all offended when someone suggests you use the search function. You know you will.

 

[Romix]

Why would someone paint a board? Are you referring to the solder mask, the (usually) green coating? If so, try reading this post: http://goldrefiningforum.com/~goldrefi/phpBB3/viewtopic.php?f=49&t=4831
If you are actually talking about painted boards, maybe try some paint remover. :|

Yes green coating, that what I talking about, thanks for link.

 

[Claudie]

For solder mask removal, this link is probably more help to you than the previous one I posted: http://goldrefiningforum.com/~goldrefi/phpBB3/viewtopic.php?f=52&t=6665

Here is a link to a better search engine to use when searching the forum: http://goldrecovery.us/forum_search.asp

 

[Romix]

For solder mask removal, this link is probably more help to you than the previous one I posted: http://goldrefiningforum.com/~goldrefi/phpBB3/viewtopic.php?f=52&t=6665

Here is a link to a better search engine to use when searching the forum: http://goldrecovery.us/forum_search.asp

Thanks.

I cant find a video.

 

[Claudie]

Just to make sure the video is still there, I went there to view it. It plays fine for me.
Here is a link to the video: http://www.goldrecovery.us/goldrecovery/videos/ShowVideo.aspx?id=soldermask&yt=0
You have to log in and click "Agree" the go to the videos.

 

[Romix]

website asking me to download a plugin, that's very big risk of getting hacked. :mrgreen:

 

[Claudie]

Well, I tried, the rest is up to you. :|

 

[jason_recliner]

I can't see the video either. It seems to stick on "buffering...".

I had some success with sodium hydroxide thanks to a search on this forum. [Edit: I think Claudie's first link might even be the one I found.]
I put a PCB into a plastic take-away-meal style tray that was the perfect size, sprinkled some NaOH granules over the board and added just enough water to cover. In other words, as concentrated as possible.

It gets really quite hot. A glass beaker or corningware may be a better choice but I don't have either yet.
Do not let this stuff on your hands unless you want an interior view of them. It will burn skin and keep burning. Wear safety gear and don't let it splash.

Twenty minutes later, it had cooled and I diluted it a little and tipped it down a bathroom sink which was wanting of it anyway. Rinse the board under cold water and the mask comes off with a bit of a scrub. If I'd left it longer it might have come off even easier.

 

[Smack]

Many posts on the subject, use the search function.

Have you turned into the forum police lately Rick? Chill out and stop being so harsh on people eh? It's really not needed. The next time you ask a question you'll get all offended when someone suggests you use the search function. You know you will.

Really? If your going to jump on Rick for that post you've got some catching up to do, there have been many like it. Maybe both of you could have bit your tongue/fingers and left the replies up to someone more helpful.

 

[rickbb]

Many posts on the subject, use the search function.

Have you turned into the forum police lately Rick? Chill out and stop being so harsh on people eh? It's really not needed. The next time you ask a question you'll get all offended when someone suggests you use the search function. You know you will.

Nope, and didn't realize it would seem to be "so harsh". Not my intent and I have been told several times to use the search function when I've asked questions. Was not the slightest offended about it. Getting pointed it the right direction so I can learn is more important than just answering the question asked. Most of the time when I ask a question it's more of a where can I find the info than give me the info.

 

[Harold_V]

Many posts on the subject, use the search function.

Have you turned into the forum police lately Rick? Chill out and stop being so harsh on people eh? It's really not needed. The next time you ask a question you'll get all offended when someone suggests you use the search function. You know you will.

Nope, and didn't realize it would seem to be "so harsh". Not my intent and I have been told several times to use the search function when I've asked questions. Was not the slightest offended about it. Getting pointed it the right direction so I can learn is more important than just answering the question asked. Most of the time when I ask a question it's more of a where can I find the info than give me the info.

For starters, spaceships needs to leave the moderating duties to the moderators. I take exception to anyone who places themselves in that position. You should not have been reprimanded for your comments.

The advice to search the forum is sanctioned by me, and I expect by all moderators. We've been trying to get readers to do that for a long time now, and there should be NO exceptions. If a person needs help in searching by the proper terms, that I understand, but to ask questions that have been answered numerous times is NOT ACCEPTABLE, and it's not going to become acceptable.

When new readers ask questions that display the fact that they have done little to nothing to help themselves, that's exactly the type of response we expect they should receive. We WANT them to search the forum. If they don't have enough time, or they don't have enough interest to learn properly, we don't want to be responsible for helping them in any way. That's not what we're here for. Our motto is refiners helping refiners, not refiners helping morons. We want to encourage every reader to read Hoke's book (to learn the basics, and get a clue about the terms we use on this board), and then to study that which has already been posted time and again. Posting the same information repeatedly is just making this board more and more difficult to use.

I'm not going to be so kind to the next person who assumes he's a moderator. He may just find himself on the outside looking in. I do not expect readers, here, to correct other readers. If any of you have an issue with a reader, report it to one of the moderators and allow them to deal with the problem. In this case, it turns out the problem is really the person who is outspoken. He should have kept his opinion to himself, as it goes against board policy. I don't look upon that kindly. Knock it off, spaceships.

Harold

edit

 

[necromancer]

corningware may be a better choice but I don't have either yet.

i find pyroceram corningware in donation stores, i have about 20 different square pots + 1 very nice 750ml round pot with a handle
i can buy them with lids for 4 to 6 dollars, much better price then buying new ($70.00 for 4 pc set = 2 square pots + 2 lids)
you also may want to try freecycle.org, choose your town or city & keep your eyes open or just ask.

 

[MarcoP]

Pyroceramic is P market, if that is correct where I live is near impossible to find them, would I be able to do the same things with Pyrex too?

 

[Geo]

Pyroceramic is P market, if that is correct where I live is near impossible to find them, would I be able to do the same things with Pyrex too?

Never use pyrex on an open burner or electric burner unless it is made for it. Visions cookware by corning or the corning Pyroceram bakeware is recommended for direct heating.

 

[necromancer]

yes, but the corningware is a good choice due to its indestructibility & heat resistance.
you can heat them up red hot & put them on a cool metal shelf without them exploding due to the temperature difference.

i have treated mine very badly and they stay intact, the tops are not as durable but do make a good cover to keep in the fumes.

if you like i would be willing to ship one out to you at no extra cost if you pay the shipping & face value of the corningware.

pm me if that is worth your while. there is always a cheap slow cooker with ceramic insert if you are not using it for hot nitric baths or incinerating.

i have also made a post with a link to corningware product numbers & information

 

[necromancer]

this is a power supply board, it's a 1/16th inch sheet of copper alloy. other then the gold connectors there is layers of gold under the solder mask

i put arrows in the photo showing where the gold is under the solder mask

gold coating is between the arrows.

i will end up putting this board on a hot sand bed to remove the components then remove the solder mask to expose the gold.
not sure how i will remove the gold yet, maybe the A/P method due to the large amount of copper on the board.

 

[MarcoP]

Thank you Geo I will surely keep that in mind when choosing.

However I had very hardly obtained P marked corning ware and I managed to crack it within few days. I did place a 1/3 full beaker inside the empty corningware and then put on top of my electric burner, I did wanted to evaporate the solution down so I went to 80°C (temp inside the beaker) but after quite few minutes the, supposedly pyroceramic, broke. I would image it did happen because the cornigware was empty, silly me, and by putting water (under the main liquor level) everything would have gone ok.

Hey necromancer, thank you very much for your offer. I'll keep looking while keeping your offer in mind. Really, really appreciated.
I believe there is an issue with the arrows in your photos as none of them are pointing to gold plated areas. I normally scratch the solder mask with a steel blade to really see if the underneath plating propagate all over the surface area or it's just few dots here and there.