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Anonymous Poster #1

Rust Prevention Additives for Wet Blasting Steel

05/15/2016 10:22 PM

I have some rusted steel plates to blast , wet blasting is the only method permitted for this location due to environmental controls.

What chemicals can be added to prevent flash rust from forming for a few days ?

I have seen holdtite used before but its around $ 350 per 20 litre drum.

http://www.holdtight.com/

Is there a cheaper way to do this ?

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Guru

Join Date: Oct 2008
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#1

Re: rust prevention additives for wet blasting steel

05/15/2016 10:37 PM
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Anonymous Poster #1
#3
In reply to #1

Re: rust prevention additives for wet blasting steel

05/15/2016 11:11 PM

country is Australia ( small island in the South Pacific )

environmental issues are " no dust whatsoever permitted "

wet blast allows catch mats ( plastic ) to be laid over the ground and swept up afterwards

Holdtight is expensive here , Holdblast is another product slightly cheaper @ $ 280 AUD but i am sure there must be a better way ?

I have only 1 day of blasting to do this and trying to save money as you do.

I have heard that vinegar can work and baking soda too but yet to try them

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Guru

Join Date: Mar 2007
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#5
In reply to #3

Re: rust prevention additives for wet blasting steel

05/15/2016 11:26 PM

I've heard white or apple cider vinegar and water for removing rust, but as a preventative always used primer....Maybe you could contact a local chemist for a solution...

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Power-User

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#15
In reply to #3

Re: rust prevention additives for wet blasting steel

05/17/2016 3:19 AM

Is there anyway you can construct a room, that isolates you and what you need to do, from the enviroment? So containing the dust and, enabling easy clear up and containment, for removal from the island.

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#2

Re: rust prevention additives for wet blasting steel

05/15/2016 11:08 PM
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#4

Re: rust prevention additives for wet blasting steel

05/15/2016 11:22 PM

This may be totally off the wall, but can you do a wet blast with some sort of very light oil rather than water?

Patent app 9,256,185, if nobody has thought of it before.

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Anonymous Poster #1
#6
In reply to #4

Re: rust prevention additives for wet blasting steel

05/15/2016 11:26 PM

No

it interferes with painting

even salts are detrimental to paint coatings .

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#7
In reply to #6

Re: rust prevention additives for wet blasting steel

05/15/2016 11:31 PM

How about oil-based paints? Or some non-rusting solvent to get rid of the light oil? Or some other metal than carbon steel?

Of course, Robin Hood can shoot himself in the foot twice, with the second shot landing directly on top of the first.

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#8
In reply to #6

Re: rust prevention additives for wet blasting steel

05/16/2016 3:15 AM

So, paint it immediately after blasting, then.

Otherwise this thread becomes another example of "20 Questions".

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Anonymous Poster #1
#9
In reply to #8

Re: rust prevention additives for wet blasting steel

05/16/2016 3:20 AM

learn to read english son

wet blasted steel will form surface rust as it dries out.

if the item cant be painted immediately then a rust inhibitor is required.

...this thread becomes another example of ignoranus .

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Guru

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#11

Re: Rust Prevention Additives For Wet Blasting Steel

05/16/2016 8:33 AM

Phosphoric acid.

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Commentator

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#12

Re: Rust Prevention Additives for Wet Blasting Steel

05/16/2016 10:58 PM

POR-15 Rust Preventive Coating

Coating dries faster when moisture is present.

www.por15.com/por-15_rust_preventive_coating

I have not tried but sounds promising.

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Associate

Join Date: Jun 2014
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#13

Re: Rust Prevention Additives for Wet Blasting Steel

05/16/2016 11:15 PM

After descaling the metal, usually a water break test is required to determine the metal's cleanliness.

Make sure what ever additive you use will allow the metal to pass the water break test (if required).

Why would you descale the metal before you are ready to use it?

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#14

Re: Rust Prevention Additives for Wet Blasting Steel

05/17/2016 12:31 AM

A 10 to 1 mix water to Molasses will normally slow the reformation of rust on blasted steel, but you will need to clean it off before painting.

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Anonymous Poster #2
#16

Re: Rust Prevention Additives for Wet Blasting Steel

05/17/2016 6:01 AM
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Member

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#17

Re: Rust Prevention Additives for Wet Blasting Steel

05/17/2016 9:30 AM

Phosphoric acid is possibility but any PO4 material has promise.

There are other possibilities but they should be considered in light of whether you intend to paint .A filming chemical is just what it says,,, it will adhere to the surface.

1. A filming amine such as octadecylamine will definitely solve your problem when applied in very small amounts with steam. See your industrial water treating consultant/boiler water treating engineer for a small amount, it is relatively cheap . It will protect steel from moisture. I have used this in steam from boilers in food caning operations to prevent cans from rusting.Another possibility would be to obtain a small amount of a blend of phosphate/chromate/zinc blend of chemicals from your water treating professional. This 3 blend was used successfully for many years to control corrosion in cooling tower water.If chromate will be a problem with your environmental regulators, then there are non chromate compounds that would be of some value.(Obtainable from a reputable water treatment supplier)

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#18

Re: Rust Prevention Additives for Wet Blasting Steel

05/17/2016 10:30 AM

For a time, potassium bichromate acts as an inhibitor of rust.

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#19

Re: Rust Prevention Additives for Wet Blasting Steel

05/23/2016 12:03 PM

There is a very good way to solve your problem; However, you should consult with a qualified chemist due to the hazardous nature of this chemical,i.e., at 35% activity it has a reduced hazardous explosive property and at a lower concentration, even less. Again, you should consult with a qualified chemist due to it's explosive and toxic property. Hydrazine is used as a rocket fuel!

Another way to obtain the protective property of hydrazine; to purchase Hydrazine in the less hazardous form of catalyzed carbohydrazide. Again , you should contact a qualified professional chemist.

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