Aluminum and bleach??? What did I do???

7 replies to this topic
  • RCannon

Posted September 30, 2005 - 04:20 AM


I needed to get a rear brake carrier for my sons YZ 400f. The shop wanted an arm and a leg for it, so I looked on ebay. I found one, the price was right, so I went for it.

The carrier arrived. I assumed the previous owner used it in the Paris to dakar rally just after he completed the baja 1000. It looked rough. Covered in oil, and scratched. Still it was functional.

I cleaned as much as I could. At the same time I happened to be cleaning my garage sink with bleach. I went ahead and tossed the carrier in the sink. Hopefully this would eat away some of the grease. I got distracted. 20 minutes later I went back and the aluminum carrier was a dark black color.

I cleaned the bleach off and sprayed the carrier with oil. This morning it looks great. The color is dark grey...similar to a hard anodized color. It appears as durable as any stock finish.

My question is...What the hell did I do? How does the bleach turn the aluminum black????

It looks good enough that I may try "bleaching" some of the other trashed parts on the bike.

Damn, now I know how Thomas Edison felt. LOL

  • sirthumpalot

Posted September 30, 2005 - 05:07 AM


Not sure if it just changes the color or actually does any damage, BUT some citris based degreasers will do the same thing to aluminum. I've had personal experience with "Purple" degreaser and a set of Mazda B2200 pistons (don't ask, I was a kid). I will say those pistons were still going strong 30k miles later (about 195k miles total on them) when I gave the truck to a college friend, so maybe your brake caliper will be OK after all.

Now Mr. Edison, stay away from the electricity! :applause: :banghead:

  • im_slo_on_my_sm

Posted September 30, 2005 - 06:09 AM


Hey this sounds interesting, can you post a pic?

i might get bleaching if it doesn't affect strength?

  • MotoGoalie

Posted September 30, 2005 - 06:52 AM


Yes, it was a chemical reaction, much like Copper turning green, that aged your aluminum.

For the short period of time that it was in there, you did no damage.

You could buff it out if you wanted to.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • matt116

Posted September 30, 2005 - 03:33 PM


You just oxidized the aluminium like steel rusting.
I think the dry powdered cleaners like comet contain aluminium oxid and bleach, but they don't react with each other until mixed with water.

  • RCannon

Posted September 30, 2005 - 03:40 PM


I can take a picture, but have no idea how to post. The color is great. It looks like a dark, hard anodized finish. Much better looking than stock.

I might try some of the old, ugly aluminum parts. It looks better now than before!

I can e mail a picture if you contact me at

  • MisterMan

Posted September 30, 2005 - 09:12 PM


bleach+gas in car's gas tanks makes rust within 13 hours....oh, wait, what was the question? lol. it should b fine. if it shatters, you'l know it lol.

  • RCannon

Posted October 01, 2005 - 04:58 AM


The color looks excellent. Several shades ddarker than bare aluinum.

I thin i will run it. I cannot imagine it being damaged.

Related Content


Is the 2016 GYTR Yamaha YZ450F too fast? by Fryboy

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  241 replies

Baja Designs YZ 400/426/450 General Discussion by Baja Designs

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  51 replies

yz400f throttle bog by yz400fmaniac

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  28 replies

100 hrs on 2014 yz450f, shim valves or replace them? by ttr230rider6

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  79 replies

Any Yz450FX engine failures? by jrusher

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  33 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.