| 摘要 |
PURPOSE:To improve the corrosion resistance of the easily corrodible parts of the cathode chamber of an electrolytic cell for salt water at a low cost by coating the inside wall surfaces of the vapor phase parts formed in the upper part of the above-mentioned cathode chamber with thermally sprayed layers of a specific corrosion-resistant metal. CONSTITUTION:NaOH and gaseous H2 are formed in the cathode chamber of the diaphragm type electrolytic cell for producing NaOH and gaseous Cl by electrolyzing the salt water and the vapor phase parts A are formed in the upper part of the cathode chamber 3. The gas-liquid mixed phase flow of the gaseous H2 and NaOH-contg. soln. is then discharged from an aperture 7 and the upper vapor phase parts are easily corroded by such flow. The parts of the inside walls 8 in the vapor phase parts are thermally sprayed with the corrosion-resistant metal of Ni or Ni alloy such as 'Inconel(R)' to 50-500mum thickness and the other parts are constituted of a mild steel, etc., by which the electrolytic cell for salt water having the highly corrosion resistant cathode chamber is obtd. at a low cost. |
