Method for cleaning of spot electrode

Abstract

Abstract PURPOSE:To remove staining materials easily and accurately by immersing a spot electrode for welding of stained surfaces into electrolyte contg. disodium ethylenediaminetetraacetate, ammonium chloride and sodium chloride at specific ratios and subjecting the same to contact potential electrolysis. CONSTITUTION:A spot electrode for welding stuck with staining materials on the surface is immersed in the electrolyte contg. 1-10wt% disodium ethylenediaminetetraacetate, 1-10wt% ammonium chloride, and 0.5-5wt% sodium chloride and is subjected to constant potential electrolysis. With the EDTA-NaCl type electrolyte as a base, a suitable amount of ammonium chloride is added thereto in this way, then it acts as a masking agent for the Cu in the staining materials eluted by electrolysis and as a dissolution accelerator for the Zn in the staining materials, thereby increasing the polarization potential difference between the spot electrode and the staining materials to a sufficient degree in practicable use.

Inventors

• 👤 Toshihiko Yamazaki
• 👤 Koji Tarumoto

Bibliographic Details