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
On Tue, Jul 26, 2022 at 12:35 PM sajeed zaheer <sajeed7674@gmail.com> wrote:
ASTM A 380--On Tue, Jul 26, 2022 at 11:19 AM Anilkumar G <akg.nitt@gmail.com> wrote:Dear ExpertsDo 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.RegardsAnilkumar--
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