Oxalic acid after-work

Drake Abrahamsson /

So I have oxalic acid in my maxi tank right now, cleaning it all out as suggestion from a previous post ( https://www.mopedarmy.com/forums/read.php?6,4301134 ). I've had it in for 24 hours and I was thinking of keeping it in for 48. Does anyone know if that sounds good? The original oxalic acid discussion said "a few days" and I'm a big numbers guy and I like having exact times and such. lol

What should I do after I drain the tank of the oxalic acid? Do I fill the tank with a water & baking soda solution to neutralize it? Do I rinse it with deionized water? Premix?

Thanks for the help in advance!

Re: Oxalic acid after-work

Like everything else , there are no absolutes .

Your tank may be more or less rusted than mine was .

I left the acid mix in my Simplex tank for about 24 hours . Dumped the mix into a clean tub . Rinsed the tank with clean water . Inspected and decided another day of acid mix was in order .

Oxalic acid leaves a coating after rinse .

Note the lower part of the brake plate has been wiped clean . The upper part still has the coating .

That coating can be left in the tank . It doesn't hurt anything being mixed with fuel .(edited)

Re: Oxalic acid after-work

Drake Abrahamsson /

> P D Wrote:

> -------------------------------------------------------

> Like everything else , there are no absolutes .

>

> Your tank may be more or less rusted than mine was .

>

> I left the acid mix in my Simplex tank for about 24 hours . Dumped the

> mix into a clean tub . Rinsed the tank with clean water . Inspected and

> decided another day of acid mix was in order .

>

> Oxalic acid leaves a coating after rinse .

>

> Note the lower part of the brake plate has been wiped clean . The upper

> part still has the coating .

>

> https://i.postimg.cc/h45Z1LBP/HPIM1559.jpg

>

> That coating can be left in the tank . It doesn't hurt anything being

> mixed with fuel .

Thanks for being the authority on oxalic acid! I really liked this method. One question: what’s the crystallization? I left my flywheel cover in some just to see what was going on inside the tank and this was the result. Is that a byproduct of the rust-oxalic acid reaction or could it be a result of the minerals/salts in the sink water I used with the oxalic acid? More curious than anything at this point, it seems like it comes off easily

E4A46043-3F63-442D-BC6A-82A4CE71623C.jpeg

Re: Oxalic acid after-work

I believe that is simply a build up of the coating I showed in this pic :

I've had that same experience a couple times and like you said , it comes off fairly easily . I left one part soaking for a couple weeks ( testing ) and that build up was thick . I had to use a stiff brush to remove it . Maybe it has something to do with the type or grade of steel ???

And , as much as I'd like to be , I'm just a satisfied user of Oxalic acid . Definitely not an authority on the subject . ;)

Re: Oxalic acid after-work

Drake Abrahamsson /

> And , as much as I'd like to be , I'm just a satisfied user of Oxalic

> acid . Definitely not an authority on the subject . ;)

Well, you’re as helpful as one! Maybe I assumed so because I’ve seen the pictures of your results on literally every single forum that mentions oxalic acid. Either way, thanks heaps!

Re: Oxalic acid after-work

You're welcome . :)

Re: Oxalic acid after-work

A numbers guy eh?

Oxalic acid is an organic compound with the formula C2H2O4. It is a colorless crystalline solid that forms a colorless solution in water. Maxi tank is 3.2 litres or 0.845 US gallons so given the rate of its acidic and chelating properties,if you are mixing oxalic acid (Ethanedioic Acid Dihydrate) powder with hot water at 3 tablespoons to a gallon of distilled water (or reverse osmosis filtered water) you can expect it to derust the tank in 36.5 hours.

> Drake Abrahamsson Wrote:

> -------------------------------------------------------

> So I have oxalic acid in my maxi tank right now, cleaning it all out as

> suggestion from a previous post (

> https://www.mopedarmy.com/forums/read.php?6,4301134 ). I've had it in

> for 24 hours and I was thinking of keeping it in for 48. Does anyone

> know if that sounds good? The original oxalic acid discussion said "a

> few days" and I'm a big numbers guy and I like having exact times and

> such. lol

>

> What should I do after I drain the tank of the oxalic acid? Do I fill

> the tank with a water & baking soda solution to neutralize it? Do I

> rinse it with deionized water? Premix?

>

> Thanks for the help in advance!

Re: Oxalic acid after-work

Drake Abrahamsson /

> Rebel Moby Wrote:

> -------------------------------------------------------

> A numbers guy eh?

>

> Oxalic acid is an organic compound with the formula C2H2O4. It is a

> colorless crystalline solid that forms a colorless solution in water.

> Maxi tank is 3.2 litres or 0.845 US gallons so given the rate of its

> acidic and chelating properties,if you are mixing oxalic acid

> (Ethanedioic Acid Dihydrate) powder with hot water at 3 tablespoons to a

> gallon of distilled water (or reverse osmosis filtered water) you can

> expect it to derust the tank in 36.5 hours.

I love you

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