Formation of a sodium depletion layer on a soda lime glass surface was accelerated efficiently using a corona discharge treatment in H-2 atmosphere. One origin of such acceleration was the preferential generation of H+ with a larger mobility at an anode needle end with a lower applied voltage than that in air. The second origin was the applied voltage across the glass plate during the corona discharge treatment, which was estimated theoretically as 2.7 times higher than that in air. These two effects doubled the depletion layer thickness compared with that in air. (C) 2014 Elsevier B.V. All rights reserved.