Rust removal, better than evaporust and 10x cheaper..

[icetech]

I wonder if this would faster at derusting if the solution was heated with an immersion heater to 140f?

dunno.. it's very fast as is.. just a few hours for most things i have done. in a ultrasonic cleaner it would be awesome though

 

[Rishi]

I wonder if this would faster at derusting if the solution was heated with an immersion heater to 140f?

yes, it would. In the winter months, the garage is cold and the derusting process is much slower. When the parts are small enough for a pyrex baking dish, I've baked them in solution in the oven at 150* for 30 minutes, and I leave the dish in there a few hours as it cools. The wife won't approve, so be discrete.

 

[Rishi]

dunno.. it's very fast as is.. just a few hours for most things i have done. in a ultrasonic cleaner it would be awesome though

I enjoy the built-in heater of my ultrasonic cleaner for many things. But I've been leery putting acids in there, concerned they may react with the stainless steel tank. The formula (100g citric acid/40g washing soda/1L water) described by the youtube video in the OP is still a pH of around 2. Only half (more or less) of the acid is being neutralized.

 

[RJ Squirrel]

The formula (100g citric acid/40g washing soda/1L water)

Hey this brings up my next question is there a simpler formula like a cup and a half of this and 1/2 cup of that, or do you really need to measure it out on a gram scale? Does it need to be that precise?

 

[snakeoil24]

Yes you can use a cup method figure 1 cup citric and 1/2 cup washing soda 1 quart water

 

[Rishi]

Does it need to be that precise?

No, it doesn't. FYI, you're neutralizing about half the acid - putting in half as much without washing soda might do the same thing.

I have a digital kitchen scale, and I use it to measure flour when baking bread or biscuits, over using the scoop. So I can easily measure in grams. I may be a geek, but when sharing the formula, I felt using weights was best, ya'll can work it out.

Yes you can use a cup method figure 1 cup citric and 1/2 cup washing soda 1 quart water

I think snake's formula is too strong. 1 cup of citric acid is about 240g.
So, a "cup formula" (makes 1 gallon) might look like:

2 cups Citric Acid
1 gallon Water (distilled is best, reverse osmosis, or tap water, take your pick)
1 cup Washing Soda

To make a quart:

1/2 cup Citric Acid
1 quart (32 ounces) water
1/4 cup Washing Soda

 

[RJ Squirrel]

Thanks guys for simplifying the recipe, I will give it a try and report back!