Technician A says te zinc phosphate coating will re-generate if a galvanized steel surface is scratched. Technician A says weld-through coating vaporizes and burns away in the weld zone as the weld nugget sufficiently protects the metal and it is no longer needed. Who is correct?

Question

Quizplus · Accepted Answer

Technician A is correct in stating that the zinc phosphate coating will re-generate if a galvanized steel surface is scratched. This is due to the corrosion-resistant properties of zinc, which react with oxygen and moisture in the atmosphere to form a protective layer of zinc oxide.

Technician B is incorrect in stating that weld-through coating vaporizes and burns away in the weld zone as the weld nugget sufficiently protects the metal and it is no longer needed. In fact, weld-through coatings are designed to remain in place during welding and provide additional protection for the metal against corrosion.

Technician a Says Te Zinc Phosphate Coating Will Re-Generate If