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Removing yellow cad off of bolts?

Started by shelbydoug, February 25, 2021, 09:36:24 AM

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shelbydoug

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.
68 GT350 Lives Matter!

CharlesTurner

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.
Charles Turner
MCA/SAAC Judge

shelbydoug

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?
68 GT350 Lives Matter!

s2ms

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.
Dave - 6S1757

Special Ed

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.

shelbydoug

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
68 GT350 Lives Matter!

shelbymann1970

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
Shelby owner since 1984
SAAC member since 1990
1970 GT350 4 speed(owned since 1985).
  MCA gold 2003(not anymore)
1969 Mach1 428SCJ 4 speed R-code (owned since 2013)
"2nd" owner of 68 GT500 #1626

shelbymann1970

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"?
Shelby owner since 1984
SAAC member since 1990
1970 GT350 4 speed(owned since 1985).
  MCA gold 2003(not anymore)
1969 Mach1 428SCJ 4 speed R-code (owned since 2013)
"2nd" owner of 68 GT500 #1626

shelbymann1970

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
Shelby owner since 1984
SAAC member since 1990
1970 GT350 4 speed(owned since 1985).
  MCA gold 2003(not anymore)
1969 Mach1 428SCJ 4 speed R-code (owned since 2013)
"2nd" owner of 68 GT500 #1626

shelbydoug

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.
68 GT350 Lives Matter!

CharlesTurner

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.
Charles Turner
MCA/SAAC Judge

rockhouse66

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.

shelbydoug

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.
68 GT350 Lives Matter!

gt350shelb

Some where some one is driving their collector car for the last time but they don't know it . Drive your car every time like it could be the last memory of it .

J_Speegle

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
Jeff Speegle- Mustang & Shelby detail collector, ConcoursMustang.com mentor :) and Judge