Since the yellow cad eventually washes off of it's silver zinc cad plating, is there a way of expediting that on new yellow cad bolts? Simply. This isn't NASA.
I'm guessing you're referring to gold dichromate on zinc plated parts? If so, I've found that evaporust will remove it safely. I've done this on several parts that I had re-plated and the gold didn't turn out good. I have the yellow gold solution to dunk them in.
There are other quicker methods, like vinegar (if I remember right). Or, quick acid dunks.
Quote from: CharlesTurner on February 25, 2021, 09:40:57 AM
I'm guessing you're referring to gold dichromate on zinc plated parts? If so, I've found that evaporust will remove it safely. I've done this on several parts that I had re-plated and the gold didn't turn out good. I have the yellow gold solution to dunk them in.
There are other quicker methods, like vinegar (if I remember right). Or, quick acid dunks.
Yep. "Evaporust"? What is that? A rust remover solvent?
Just did this on some bolts. Was too cheap to buy anything new (didn't have any evaporust handy) so raided the household cleaning shelf, found some toilet bowl cleaner called "Kaboom" used to remove scale & rust stains. It contains hydrochloric acid, made quick and easy work of the yellow zinc.
Evaporust is a great product that car guys need and u can buy at local stores and reuse it when needed to clean car parts.
I just tried it. It washes the yellow off like it is watercolor paints! It doesn't even seem to leave a residue.
Now I know what I'll be doing all day. Thanks. Very helpful suggestions. ;D
Quote from: shelbydoug on February 25, 2021, 09:47:10 AM
Quote from: CharlesTurner on February 25, 2021, 09:40:57 AM
I'm guessing you're referring to gold dichromate on zinc plated parts? If so, I've found that evaporust will remove it safely. I've done this on several parts that I had re-plated and the gold didn't turn out good. I have the yellow gold solution to dunk them in.
There are other quicker methods, like vinegar (if I remember right). Or, quick acid dunks.
Yep. "Evaporust"? What is that? A rust remover solvent?
Find it in many places. I bought mine off of Amazon a few years ago. A bucket with a inner screen bucket. I just put rusty parts in it and let them sit. BY no means am I supporting the seller in the link-just the first link that came up. I like the bucket method. I have also used the Jell on my 428CJ engine and headers.
https://www.walmart.com/ip/Evapo-Rust-The-Original-Super-Safe-Pail-Rust-Remover-Water-based-Non-Toxic-Biodegradable-3-5-Gallons/48810394?wmlspartner=wlpa&selectedSellerId=1330&&adid=22222222227037637421&wl0=&wl1=g&wl2=c&wl3=92176423577&wl4=aud-430887228898:pla-183842078177&wl5=9017001&wl6=&wl7=&wl8=&wl9=pla&wl10=100362769&wl11=online&wl12=48810394&veh=sem&gclid=Cj0KCQiAst2BBhDJARIsAGo2ldWDJ61vXUXqngQLBDWTg2rI-gzssxBwHge3sy1U1WVx9AfgHEnczOkaAtHVEALw_wcB
https://www.ebay.com/sch/i.html?_nkw=Evapo%20Rust%20Remover&norover=1&mkevt=1&mkrid=711-156598-766339-8&mkcid=2&keyword=evapo%20rust%20remover&crlp=435081408607_&MT_ID=590136&geo_id=10232&rlsatarget=aud-649939740364:kwd-300703209816&adpos=&device=c&mktype=&loc=9017001&poi=&abcId=1145996&cmpgn=8068618706&sitelnk=&adgroupid=78578601090&network=g&matchtype=e&gclid=Cj0KCQiAst2BBhDJARIsAGo2ldUHK9SG1TepL2GF1K5loNv5urH1dud7wwCXNBx98JcFPMd7cNn0r90aAtBSEALw_wcB
Quote from: shelbydoug on February 25, 2021, 10:18:38 AM
I just tried it. It washes the yellow off like it is watercolor paints! It doesn't even seem to leave a residue.
Now I know what I'll be doing all day. Thanks. Very helpful suggestions. ;D
Tried what, Doug? "Kaboom"?
Quote from: CharlesTurner on February 25, 2021, 09:40:57 AM
I'm guessing you're referring to gold dichromate on zinc plated parts? If so, I've found that evaporust will remove it safely. I've done this on several parts that I had re-plated and the gold didn't turn out good. I have the yellow gold solution to dunk them in.
There are other quicker methods, like vinegar (if I remember right). Or, quick acid dunks.
Can you elaborate your process and the solution you are using? Thanks. Gary
Quote from: shelbymann1970 on February 25, 2021, 10:22:36 AM
Quote from: shelbydoug on February 25, 2021, 10:18:38 AM
I just tried it. It washes the yellow off like it is watercolor paints! It doesn't even seem to leave a residue.
Now I know what I'll be doing all day. Thanks. Very helpful suggestions. ;D
Tried what, Doug? "Kaboom"?
I had a little "jelly", grape I think, laying around. Tried it on one bolt. Worked great.
Went to Lowe's and bought some Rustoleum Rust remover Jelly in the squirt bottle. Works the same way. Tastes great, less filling.
Quote from: shelbymann1970 on February 25, 2021, 10:25:13 AM
Can you elaborate your process and the solution you are using? Thanks. Gary
The re-dipping? I have the gold dichromate stuff, I think Caswell sells it. Mix it with water per spec ratio and just dunk the parts for 30-60s. Use a heat gun to dry as they come out.
This won't work very well on bare metal parts. A shiny silver zinc base is required to get the best results.
I do same as Charles. The thing about Evaporust on these parts is it will actually brighten the zinc as a side benefit of removing the dichromate.
Quote from: rockhouse66 on February 25, 2021, 06:22:20 PM
I do same as Charles. The thing about Evaporust on these parts is it will actually brighten the zinc as a side benefit of removing the dichromate.
I didn't use Evaporust but they did come out pretty shiny.
https://www.safestrustremover.com/howto.html
works like a charm
Have used vinegar to remove the dichromate in the past. If full strength have to watch it as it can go too far and start removing the base zinc coat if you leave to too long
Quote from: J_Speegle on February 25, 2021, 09:47:14 PM
Have used vinegar to remove the dichromate in the past. If full strength have to watch it as it can go too far and start removing the base zinc coat if you leave to too long
With the Rustoleum, the yellow wipes off in about 20 seconds or so on a new bolt. It doesn't seem to affect the silver zinc at all.
I washed them down with water and buffed them slightly on a wire wheel.
Quote from: shelbydoug on February 26, 2021, 07:10:34 AM
........I washed them down with water and buffed them slightly on a wire wheel.
Why would you want the final look to be brighter or shinier? Just asking :)
Would be concerned about removing the zinc with the wire wheel. But maybe it works for what ever your doing. Fir many applications/hardware I'm having to dull down the finish because it is too bright or shinny due to the way the zinc is down currently around here
Can understand having smooth shiny finish on some nuts but would get there by prepping the metal first and not having them dichromated when plated zinc.
Quote from: J_Speegle on February 26, 2021, 01:35:42 PM
Quote from: shelbydoug on February 26, 2021, 07:10:34 AM
........I washed them down with water and buffed them slightly on a wire wheel.
Why would you want the final look to be brighter or shinier? Just asking :)
Would be concerned about removing the zinc with the wire wheel. But maybe it works for what ever your doing. Fir many applications/hardware I'm having to dull down the finish because it is too bright or shinny due to the way the zinc is down currently around here
Can understand having smooth shiny finish on some nuts but would get there by prepping the metal first and not having them dichromated when plated zinc.
Shiny looks clean for now. It will oxidize naturally into that dull junk yard look soon enough. Plus you need to be sure that the chemicals are off of it so they don't eat through the zinc.
The luster on zinc parts naturally varies new. It can be very dull or almost chrome like.
It also depends on if they are dipped or E.G.
Zinc survives 12 hours in a salt spray cell.
Yellow chromated zinc survives 250 hours.
Clear chromate survives 175.
Zinc plate, yellow chromate, use a sodium carbonate leach back for clear look. 250hours.
Or just dip a bolt in acid and lose 95% of it's protective coating.
Quote from: s2ms on February 25, 2021, 10:08:05 AM
Just did this on some bolts. Was too cheap to buy anything new (didn't have any evaporust handy) so raided the household cleaning shelf, found some toilet bowl cleaner called "Kaboom" used to remove scale & rust stains. It contains hydrochloric acid, made quick and easy work of the yellow zinc.
Kaboom-another product you can thank Billy Mays (rip) for pitching
I have been using this product to remove cad and zinc plating from hardware that I want parkerized.
https://dwdavies.com/product/lime-x
You could use the product found at most hardware or grocery stores also called Lime-Away.
Soak the parts and rinse with clear water.
Quote from: CharlesTurner on February 25, 2021, 02:51:58 PM
Quote from: shelbymann1970 on February 25, 2021, 10:25:13 AM
Can you elaborate your process and the solution you are using? Thanks. Gary
The re-dipping? I have the gold dichromate stuff, I think Caswell sells it. Mix it with water per spec ratio and just dunk the parts for 30-60s. Use a heat gun to dry as they come out.
This won't work very well on bare metal parts. A shiny silver zinc base is required to get the best results.
Thanks, Charles. Gary