This is an installed structure in a warm and humid place, I'm seeking to find a good way to remove the local oxides, and after that touch up.
Dear Mohammad Amin Qobadi :
I inform you the results of our long experience. Sulfuric acid concentration of 15%, the amount of inhibitor Cetyl pyridinium chloride 0.2%, temperature 20 degrees Celsius, Steel was 36 hours in a solution. Weight loss of pure steel 1.4%. The steel contains C 0,15 %, Mn 0.50% P 0.042% , Si 0,12 %. Sulfuric acid remove the oxide layer.
Best regards.
Dear Mr. Yuri Mirgorod
So many thanks for your attention and complete explication, but it's some problems, first, the structure was installed and we are limit for this, second, the place is very hot ( about 50 degree celsius and humid, and final, could you please tell me your opinion about the time of process, 36 hours is very long time !
Best Regards
We tested inhibitor. Therefore, such a long time to measure the losses of steel. Oxide dissolves in the acid fast. Pick up time yourself. Start with 20 minutes.
Regards.
For a somewhat related discussion, also about iron oxide (rust) cleaning; albeit from polytetrafluoroethylene (PTFE), i.e. 'Teflon': https://www.researchgate.net/post/How_can_I_remove_iron_oxide_from_teflon_paddle_stirrer
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