Pickling and passivation need before painting SS surfaces

[Anilkumar G]

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

[sajeed zaheer]

ASTM A 380

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[Anilkumar G]

Dera Sajeed

A380 describes only pickling & passivation procedures in detail I believe, not about painting. Please correct me if I am wrong.

Regards

Anilkumar

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[sajeed zaheer]

Dear Anil Kumar,

Yes, you are correct ASTM A380 is only for pickling and passivation.

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[Kannayeram Gnanapandithan]

Pickling and Passivation is important if it is subjected to corrosive environment , otherwise no need

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

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[srinivas rao]

Pickling and passivation is  Not required  ,   because you are going for painting after completion of NDE but  for the process side (Accessible Root) you may need to perform if purging is not maintained properly. or any heat tints found unacceptable.

 

If you  painting is not involved ,  Yes, it is required to perform the  pickling and passivation of SS weldments 100% as due to heat generation  during welding the passivation layer will be damaged and may not be formed naturally, in general  Passivation will form naturally in air & it may take longer time to form for protection to occur. Before this period, passivation by using Chemicals may be carried out rapidly. as we are not checking for confirmation of the passivation layer formation. 

 refer any client specifications Ex. DEP 30.10.60.18 / ADNOC specifications about this requirements for stainless steels  welds 

Regards,

Srinuvasa Rao

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[james gerald]

I suppose you do sweep blasting before Painting and there is no purpose for Pickling and Passivation.

Thanks & Regards

J.Gerald Jayakumar

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[Qualique External, Abdul]

Hi , 

If there is no welding done on valves then I don't find any reason for the base material to undergo Pickling & passivation. Could you please confirm if your valve is made of SA 351 CF8M.

With Best Regards,

M.A.QUALIQUE

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[james gerald]

Glass-Bead blasting is recommended for SS.

Thanks & Regards

J.Gerald Jayakumar

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[srinivas rao]

when no welding or other heat applications on base metals  , no need to perfrom pickling and passivation 

regards,

srinivas Rao

[james gerald]

Please check the Link below.

Paint coating stainless steels – British Stainless Steel Association (bssa.org.uk)

On Tuesday, 26 July, 2022 at 01:05:58 pm GMT+4, 'james gerald' via Materials & Welding <material...@googlegroups.com> wrote:

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[sajeed zaheer]

Pickling and passivation is to remove stains and rust.

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[raj susi]

Dear Anil.

I believe, Picking and Passivation are surface treatments, where no coating is involved,

Pickling is the process used to remove weld heat tinted layers from the surface of stainless steel fabrications, and Passivation is the process of restoring the damaged oxide layer to prevent corrosion in stainless steel.

if you are going for coating, you only need to do a blasting and continue with coating with appropriate grits and approved coating system.

regards

raj

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[james gerald]

Good explanation Raj.

Please find below Link about pickling & Passivation.

Pickling and Passivation of Stainless Steel (wermac.org)

Pickling and Passivation of Stainless Steel Werner S. Pickling and Passivation are chemical treatments applied to the surface of stainless steel

Thanks & Regards

J.Gerald Jayakumar

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[Sudhakar Kuppuswamy]

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

Regards,

Sudhakar K 

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Regards,

Sudhakar K CEng MWeldI,IWE.

Welding & Metallurgical Engineer,

Email: sudhak...@gmail.com.

[Kannayeram Gnanapandithan]

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

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[Anilkumar G]

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

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[Sudhakar Kuppuswamy]

Yes, in the  below case it is required.

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[james gerald]

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

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[kingslygeo vargheese]

Due to Stellite-6 / 21  overlay, the Heat transfer will be there in the SS part also.

1. Internal PP is required.

2. Based on the above External PP may get a waiver from the Client,

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