TFG Group performs weld passivation to remove contaminants and create a surface that is resistant to corrosion. This process treats the surface of stainless steels, often with acid solutions, resulting in the metal being less susceptible to corrosion and deterioration.
TFG also electropolish where a high spec surface finish is required. This is an electrochemical process that is a super passivation of stainless steel and results in a brighter, smoother and more passive surface. This enhances the corrosion resistance of the stainless steel surface and accelerates the reformation of the passive layer.
Passivation is a critical step in maximising the essential corrosion resistance of parts and components fabricated from stainless steel.
Reasons for Weld Passivation:
- Removal of weld discolouration
- Removal of contaminants as contaminants are potential corrosion sites, which, if not removed result in premature corrosion and ultimately results in the deterioration of the component
- Removal of scale and low chromium content metal
- Restoration of chromium to heat affected area (HAZ)
- Restoration of the protective oxide layer
- Restoration of corrosion resistant properties of stainless steel
TFG performs weld passivation on all stainless steel fabrications to ASTM A380 and ensures all weld passivation is documented in-line with our ISO 9001 Quality Assurance accreditation.