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Re: [MW:32314] Is there any difference in performance betweenpickling and passivation?

By Materials & Welding
Passivation may not have Hydrofluoric acid which will etch the surface faster than Nitric acid.
Passivation is done to create an artificial passive layer ( CrO2).

THANKS & BEST REGARDS,
KG.PANDITHAN, BE, IWE,  CSWIP 3.1,
ISO 9712 Level 2 in VT,
ASNT-Level II in PT,MT,RT & UT,
LA ISO 9001-2015,
International Welding Engineer. 
CONSULTANT-WELDING & QUALITY
Mobile no: +919940739349


On Tue, Apr 20, 2021 at 4:03 PM pravean ashok <gujulapravean@gmail.com> wrote:
Dear sir 

Please find the below link

https://youtu.be/nqBLsPM88dk

Regards
Pravean

On Tue, 20 Apr, 2021, 2:21 pm Kannayeram Gnanapandithan, <kgpandithan@gmail.com> wrote:
Any Acid used in Passivation

THANKS & BEST REGARDS,
KG.PANDITHAN, BE, IWE,  CSWIP 3.1,
ISO 9712 Level 2 in VT,
ASNT-Level II in PT,MT,RT & UT,
LA ISO 9001-2015,
International Welding Engineer. 
CONSULTANT-WELDING & QUALITY
Mobile no: +919940739349


On Tue, Apr 20, 2021 at 1:09 PM pravean ashok <gujulapravean@gmail.com> wrote:

Pickling is a matal surface treatment used to remove impurities, such as stains, inorganic contaminants, rust contamination or scale 
 A solution called pickle liquor, k2 chemical paste which is usually contains nitric acid, is used to remove the surface impurities. It is commonly used to descale or clean steel in various  processes.

Passivation

Passivation is a chemical treatment for ss and other alloys that enhances the ability of the treated surfaces to resist corrosion

Passivation removes surface contamination

Passivation increase corrosion resistance

Passivation reduces the risk of product Contamination

Passivation allows you to extend system maintenance intervals




On Tue, 20 Apr, 2021, 10:59 am PK M, <pkmqaqc@gmail.com> wrote:

Dear All,

Please Explain 

 

Is there any difference in performance between pickling and passivation?

Thank you

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