Rust Disolver/Fluid for Watch Parts

[Jonno65]

Hi… 

I saw on a watch restoration video a product used to disolve or break down rust  on small parts (usually the stem area) but I can’t find the video or remember the name of the product.

Can someone recommend one?

 

 

[Jonno65]

UPDATE:

I decided to go with a  rust deoxidiser from an auto store. Smallest I could get was 250ml which is a lot when applying with an oiler! But its bubbling away now on the stem..  Fingers crossed.

Cheers

Jon

[Nucejoe]

Happy bubbling Jon. 

Will you share the name/ brand of this rust deoxidiser? 

TIA

 

[Jonno65]

50 minutes ago, Nucejoe said:

Happy bubbling Jon. 

Will you share the name/ brand of this rust deoxidiser? 

TIA

 

Hi Joe(?)

It's just a generic brand called Motospray Dexoidiser and Rust Remover. Might well be something else where you are - I'm in Perth Western Australia (a watchmaker's wilderness). 

I have applied a few times now with an oiler but yet to see if successful..  I will let you know.. Pic attached.

Jon

[Jonno65]

It worked! Wheel fell off in Ultrasonic cleaner. There is a cannon pinion underneath but is too small of a diameter for my pinion remover tool.  

[Nucejoe]

53 minutes ago, Jonno65 said:

It worked! Wheel fell off in Ultrasonic cleaner. There is a cannon pinion underneath but is too small of a diameter for my pinion remover tool.  

Thanks Jon,   what active ingredient is in this deoxidiser? 

To remove the canon pinion , 

A fine  pin vice stem holder is likely to grab the canon pinion, should  pull streight up.

Rgds

 

 

[Neverenoughwatches]

1 hour ago, Jonno65 said:

It worked! Wheel fell off in Ultrasonic cleaner. There is a cannon pinion underneath but is too small of a diameter for my pinion remover tool.  

I'd be curious to know what the ingredients are please Jonno. The problem with most rust removers is they also like to eat away at the unrusted ferrous metal. Strong concentrations of phosphoric acid will do this aggressively. I used a product once called rustins rust remover it completely dissolved an escape wheel in 4 hours and left a small black blob in its place . I should have looked up the data sheet on it first, it contains around 45 % phosphoric  acid. White vinegar thats a fairly mild concentration of acetic acid will turn steel a grey colour quickly. Citric acid seems to be one of the milder rust removers for light surface rust. The next top ingredient in Rustins is methanol so some dilution with meths would bring its active ingredient down to something more useable. 

40 minutes ago, Nucejoe said:

Thanks Jon,   what active ingredient is in this deoxidiser? 

To remove the canon pinion , 

A fine  pin vice stem holder is likely to grab the canon pinion, should  pull streight up.

Rgds

 

 

Snap Nucejoe

[RichardHarris123]

I bought this, it's slow but works and doesn't damage anything. 

[Neverenoughwatches]

42 minutes ago, RichardHarris123 said:

I bought this, it's slow but works and doesn't damage anything. 

According to the data sheet on this Rich , its 100% phosphoric acid. Actually another section of the data sheet states 10 -30% composition.  Bit vague ?

Edited April 22, 2023 by Neverenoughwatches

[RichardHarris123]

19 minutes ago, Neverenoughwatches said:

According to the data sheet on this Rich , its 100% phosphoric acid. 

The so called non hazardous one is an aqueous solution of ammonium benzoate. 

[Nucejoe]

 Thanks Neverenough , your last post encouraged and educated me.

I have a chance to buy pure generic orthophosperic acid from merc of Germany, but was scared of that prefix ortho , sounded like something that might explode. 

So it should be diluted?  I had plans to test it with pure concentration. 

You always send me diving dictionaries, what is meths ?

Rgds

 

[Neverenoughwatches]

18 minutes ago, Nucejoe said:

 Thanks Neverenough , your last post encouraged and educated me.

I have a chance to buy pure generic orthophosperic acid from merc of Germany, but was scared of that prefix ortho , sounded like something that might explode. 

So it should be diluted?  I had plans to test it with pure concentration. 

You always send me diving dictionaries, what is meths ?

Rgds

 

Haha sorry i sometimes forget we are from all over the world. Meths is our Uk term for methylated spirits which is only around 10 % methanol and 90 % ethanol ( i think the methanol is to make it toxic as well as a small amount of Bitrex, coloured purple and placed in a recognisable poison bottle.  Apparently taxed differently for its use other than as a drinking alcohol ). The small bottle of rustins rust remover is a strong concentration of phosphoric acid 45 % along with methanol and ethanol . I figured diluting it with more would reduce its aggressiveness. 

49 minutes ago, RichardHarris123 said:

The so called non hazardous one is an aqueous solution of ammonium benzoate. 

Ah ok, the one I'm looking at has a red label and contains amounts of phosphoric acid. I'm not entirely sure how much though, i think not as much as the Rustins i have.

48 minutes ago, Nucejoe said:

I had plans to test it with pure concentration. 

Based on the nearly half concentration that i used, thats going to eat though small parts. Definitely worth an experiment though to work out a good solution for rusf removing. Googles and chem suit advised

[Jonno65]

5 hours ago, Nucejoe said:

Thanks Jon,   what active ingredient is in this deoxidiser? 

To remove the canon pinion , 

A fine  pin vice stem holder is likely to grab the canon pinion, should  pull streight up.

Rgds

 

 

Good idea - my pin vice is on the way!  

This is what the bottle states:

Contains: 10-30% Benzene, Methyl.

10-30% Phosphoric Acid & Balance ingredients..

Non-Hazardous.

Jon

Edited April 22, 2023 by Jonno65

[Jonno65]

I managed to find the video that mentioned the rust dissolver - on Marshals Wristwatch Revival.  he was recommended Evapo-Rust.  In Australia here it is made by CRC. 

Video: 

https://crcindustries.com.au/products/ds/sds-EVR1.pdf

The ingredients are not clear - or at lest not the same, but he did say it is very slow and it turns the steel parts black.. It is labeled as a 'super safe rust remover'.

https://automotivesuperstore.com.au/crc-evr1?utm_term=CRC-EVR1&utm_source=google&utm_medium=cpc&gclid=CjwKCAjw0ZiiBhBKEiwA4PT9z-UbKUfVf-Fq_OKLKxp2KshYTBrPA4J3Qp75JMmMEqTIws-37f1zZRoCMz8QAvD_BwE

Edited April 24, 2023 by Jonno65