Re: [MW:33320] Pickling and passivation need before painting SS surfaces

Normally in the seat they apply stellite overlay  which is cobalt based for wear resistance. Only stainless steel can be pickled and passivated.

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On Fri, 29 Jul 2022 at 7:59, Anilkumar G

<akg.nitt@gmail.com> wrote:

Dear Experts

Thanks all for very valuable support. 

There is an overlay welding involved in the body seat of the valve. Do we need pickling and passivation inside only in this case?

Outside there will be painting. 

Regards

Anilkumar

On Thu, Jul 28, 2022 at 9:18 AM Kannayeram Gnanapandithan <kgpandithan@gmail.com> wrote:

Sweep sand blast and do painting, Pickling & Passivation not required

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 Thu, Jul 28, 2022 at 8:55 AM Sudhakar Kuppuswamy <sudhakarceng@gmail.com> wrote:

If the painting is applicable , picking and passivation is not required.

Regards,

Sudhakar K 

On Tue, 26 Jul 2022 at 12:19 PM Anilkumar G <akg.nitt@gmail.com> wrote:

Dear Experts

Do we need pickling and passivation of SS surfaces before painting them? Could you please suggest any specification relevant this requirement?

The parts are SS cast valves requiring painting.

Regards

Anilkumar

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Regards,

Sudhakar K CEng MWeldI,IWE.

Welding & Metallurgical Engineer,

Email: sudhakarceng@gmail.com.

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