Our recent project at Mead Johnson. Passivation and dye pen (non-destructive testing) of 1 unit hopper with 12 distribution funnel under RD21 metal craft.
Passivation is the process wherein a substance is changed via chemical action to become inactive or inert. Or in layman’s terms, this is the removal of surface iron with an acid solution in order to prevent rust.
For more guidelines about passivation of stainless steel, you can read more here.