removing corrosion product on the pitting area

[chemist2020]

Hi.
What is the action for corrosion product on the pitting surface?
Is it good to remove this corrosion product? Why?
do corrosion product act as a corrosion inhibitor?
We have pitting corrosion in a tank and decide to remove corrosion product ( for example by a brush).
Tank contain demin water and we can not paint it to reduce corrosion.

 

[racookpe1978]

You can almost never leave the corroding agent down in the bottom of a pitted surface and expect anything but faster additional failure and accelerated pitting.

What kind of tank wall material?
What corrosion product?
What liquid?
What kind of brush material?
How was it cleaned by the "brush" (water jet, air, sandblast, scrubbing by hand, twisted wire high-speed grinder attachment?)

 

[CoryPad]

Corrosion products can act to inhibit future corrosion. However, if this is an iron-based alloy, then that can be difficult because the corrosion products usually are porous and flake off, exposing new material to be corroded. You would need to provide more information about your particular product and environment to get definitive answers.

 

[weldstan]

I would suspect that corrosion will accelerate by removing corrosion product with a wire brush. You will be removing any protective oxide coating. Steel tanks in demin water service should always be coated.

 

[EdStainless]

unless this is stainless steel where grinding the surface to open the pits up (and adding CP) is the only chance for slowing them down.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

 

[Figueredo]

WATER TANK ALWAYS BE PAINTED