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UK General Cleaning Forum => General Cleaning Forum => Topic started by: drive surgeon on November 13, 2007, 10:37:41 pm

Title: rust removal from blockpaving,
Post by: drive surgeon on November 13, 2007, 10:37:41 pm

hi all, anyone any ideas to remove rust from blockpaving, pressure want remove it.  did i see somone say  some sort of acid does the job?, if so where do i get the stuff? thanks ;D

Title: Re: rust removal from blockpaving,
Post by: trevor perry on November 14, 2007, 11:18:33 am

there are alot of rust removers on the market but i find the best ones are hydroflorich acid based , avoid any that are hydrochloric acid based as you will find with these ones they can damage certain materials especially stainles steel, if you just put in your search engine rust removers there are many about and all as good as each other.

Title: Re: rust removal from blockpaving,
Post by: Roger Oakley on November 14, 2007, 04:01:38 pm

Quote from: drive surgeon on November 13, 2007, 10:37:41 pm

hi all, anyone any ideas to remove rust from blockpaving, pressure want remove it.  did i see somone say  some sort of acid does the job?, if so where do i get the stuff? thanks ;D

Is it rust or a plant food (fertilizer) stain as these can look the same.

Title: Re: rust removal from blockpaving,
Post by: drive surgeon on November 14, 2007, 04:33:32 pm

its rust roger. thanks.

Title: Re: rust removal from blockpaving,
Post by: Roger Oakley on November 14, 2007, 04:59:08 pm

Try Phosphoric acid

Title: Re: rust removal from blockpaving,
Post by: drive surgeon on November 14, 2007, 05:51:55 pm

where do you buy that please?

Title: Re: rust removal from blockpaving,
Post by: trevor perry on November 14, 2007, 06:16:11 pm

phosphoric acid can be found in most toilet cleaners just look under the ingredients, it is best if you leave it on the rust for about ten minutes to soak before washing off

Title: Re: rust removal from blockpaving,
Post by: Roger Oakley on November 14, 2007, 06:40:34 pm

As Trevor has said, is correct, but toilet cleaners might be a weaker soultion, look for an aluminium cleaner, most of these have a higher phosphoric acid content, Tensid do a poultice which might be what you need.

Title: Re: rust removal from blockpaving,
Post by: BDCS on November 14, 2007, 10:51:16 pm

Try looking at stainless steel cleaner from the food industry, they contain phosphoric and are formulated to remove rust marks. Some food grade descalers also contain phosphoric, also found in cola !!!!!

Title: Re: rust removal from blockpaving,
Post by: keith b on November 16, 2007, 11:19:05 am

Look for a "Oxalic" cleaner, this will remove rust stains.

Title: Re: rust removal from blockpaving,
Post by: Roger Oakley on November 16, 2007, 02:33:10 pm

Quote from: keith b on November 16, 2007, 11:19:05 am

Look for a "Oxalic" cleaner, this will remove rust stains.

Keith,
Becareful with Oxalic acid as you can't really spot clean with it, as you will have brighter/cleaner surface compaired to the rest of the surface.

Title: Re: rust removal from blockpaving,
Post by: keith b on November 17, 2007, 08:56:30 pm

OK, thanks Roger

Title: Re: rust removal from blockpaving,
Post by: Roger Oakley on November 17, 2007, 09:17:40 pm

Keith, this is what can happen if you spot clean with either Ox or Citric acid.
The first picture is where I put a hand pump down and the soluiton dribbled out.
Wasn't spot cleaning but you'll get the idea.

Title: Re: rust removal from blockpaving,
Post by: Roger Oakley on November 17, 2007, 09:18:25 pm

This picture is where I had to reverse the "new" stain that was created by the acid I was using, in this case it was citric.

Title: Re: rust removal from blockpaving,
Post by: keith b on November 18, 2007, 08:43:32 am

Roger,

Thanks for those pictures!.

What type alkaline solution or chemical did you use to get rid of the stain?

Title: Re: rust removal from blockpaving,
Post by: Roger Oakley on November 18, 2007, 03:17:01 pm

 33% Hydrochloric Acid