All ELIOTEKNOLOGY tanks benefit from passivated welds, produced on our own manufacturing lines.
Principle
Welding alters the metallurgical structure and destroys the natural passive layer (generally chromium oxide, Cr₂O₃, for stainless steel) that protects the stainless steel from corrosion.
Passivation rebuilds this layer by removing contaminants (iron oxides, free iron particles, welding residues) and promoting the formation of a uniform protective film that prevents corrosion of the stainless steel.
Objectives
- Improve resistance to corrosion (particularly pitting or intergranular corrosion).
- Eliminate impurities (free iron, oxides, welding flux residues).
- Restore the anti-corrosion properties of the alloy (e.g., 304/316 stainless steel).
- Prepare the surface for subsequent treatments (painting, coating)
Without passivation, a weld on stainless steel tends to rust locally.
