REPAIR METHOD OF PITTING DAMAGE OR CRACKS OF METALS OR ALLOYS BY USING ELECTROPHORETIC DEPOSITION OF NANOPARTICLES

摘要

Disclosed is a method of repairing pitting damage or cracks in metals or alloys using an electrophoretic deposition process. More particularly, this invention provides a method of repairing pitting damage or cracks in metals or alloys using an electrophoretic deposition process, comprising (a) preparing nano-powder particles of a metal or alloy that is the same as the metal or alloy having the pitted or cracked region; (b) adding the nano-powder particles of the metal or alloy in (a) to an organic solvent containing a dispersant, thus preparing a stabilized colloidal dispersion; (c) immersing the metal or alloy having the pitted or cracked region in the stabilized colloidal dispersion in (b); and (d) applying an electrical field to the metal or alloy having the pitted or cracked region via electrophoretic deposition to concentrate current density on the pitted or cracked region of the metal or alloy, such that the nano-powder particles of the metal or alloy having surface charges are intensively deposited in the pitted or cracked region of the metal or alloy, thereby forming a uniform layer. Compared to conventional repair methods, the repair method of the invention is advantageous because it has a short process time period, may be performed at low temperatures, has no influence on the metal around the pitting damage or cracks, and can form a continuous and dense bond, thus realizing superior mechanical strength in the repaired structure.