pickling process

Please expand upon the process that is being used and why there is a perceived problem.

Without knowing more about what you are trying to accomplish, and with which alloy, I can only recommend a starting point of 10% Nitric Acid at 70 degrees and go from there.

To solve your problem please contact: Subrata Roy Jt. GM GPT Steel Ind. Ltd. Mumbai. 009122-67513532 or 091-9967945946

All Stainless steel materials are chemically cleaned by pickling to remove sand blast residue or iron or other contaminants. The pickling solutions usually are composed of 5 to 10 % nitric acid plus 0.5 to 2.0 % hydrofluoric acid in water and used at 130 to 160 F ( 54 to 70 C ) . The treatment time is 5 to 30 minutes depending upon the thickness of the contamination oxide on the surface.

sridhar- advance institute of welding technology - chennai - india.

hi,

i using nictric acid and hydrofloric acid for the pickling process,

but i have a problem with the concentration for so. i use 40% of hf and 60 % of nitric acid in the water solution.

i don,t know how much acid should be added to the about 100 litre of water.

i use pickling process for wire drawing of material in ss 410 type. i put about 150 kg of material in the sump of 100 litre of water.

so i need help for how much acid of 40 % hf and 60% nitric acid should be added to process my work.

thanks.

As there are many papers written on this subject area, have you tried to Google the question?

Hi, what do you want to do next (after the pickling)? Are you go for plating or painting or ..... ? If you would like to go for plating, what kind of plating you intent to put and any particular requirement on the performance of the part itself (for cosmetic reason, for hardness, for corrision ....?) You may advcie.

dear , which grade of stainless you want to pickling normally 200 series pickeled in rt sulphuric acid and 300 series pickled in mixture of hcl,hno3& hf acid or .