Corrosion rate vs concentration for hydrochloric, sulfuric, phosphoric, acetic acids etc.

[bikemaniac]

Hi,

I am interested in the derusting of rusty automotive parts using "household" acids readily available everywhere.

1. I am interested in graphs/tables representing the corrosion rate (mm pr year or similar) vs acid concentration (%) of

a) mild steel
b) rust (all the oxidation stages)​

simultanously in the same acidic environment. This is to understand how much faster rust is removed from the surface compared to the base metal itsel (mild steel). Ideally I would like to see a graph where both "mild steel" and "rust" is plotted at the same time. This is to understand the ideal strength of the solution.

2. I am interested in data for:

a. Hydrochloric acid
b. Phosphoric acid
c. Nitric acid
d. Sulphuric acid
e. Acetic acid
f. Citric acic
g. Oxalic acid​

Is it possible to find such data, ideally where everything has been tested by the same team to ensure the same lab conditions?

Thanks,

Lucas

 

[EdStainless]

Buy one of the commercially available rust removal solutions.

https://www.theruststore.com/Webpage.aspx?WebpageId=22

I personally like the Bullfrog products, they the retail version made by a major manufacturer of corrosion inhibitors.

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P.E. Metallurgy, Plymouth Tube

 

[bikemaniac]

Thank you. However, I still need the acid data for "emergencies" when you dont have these specialized products.

Lucas

 

[EdStainless]

Look up some of the 'home brew' versions.
Some are based on vinegar, I prefer ones using citric, oxalic, boric, or phosphoric acids.
Dilute (5%) and slightly warmed usually does the job.

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P.E. Metallurgy, Plymouth Tube