An electrochemical investigation on pitting growth process of aluminum.

DOI Web Site 7 Citations
  • TOHMA Ken
    Technical Research Laboratory, Mitsubishi Aluminum Co., Ltd.

Bibliographic Information

Other Title
  • アルミニウムの孔食成長過程の電気化学的検討
  • アルミニウム ノ コウショク セイチョウ カテイ ノ デンキ カガクテキ ケン

Search this article

Abstract

Electrochemecal mesurements in NaCl solutions were carried out to understand the electrochemical informations during pitting growth process such as irreversibility of anodic polarization curves and variation of electrode potential with time in immersion corrosion test. In galvanostatic anodic dissolution, electrode potential rises to pitting potential immediately after current application and lower after a while. The time required for the beginning of the potential fall prolongs with increase of applied current. While the internal surface of the pits consists of a large number of crystallographic tunnels in the earlier stage of dissolution, they transform to dimples after sufficient potential fall. PH rapidly decreases and Cl- concentration increases with applied current in anodic area of electrolysis cell simulating localized corrosion. All the electrochemical informations for pitting growth are well understood in terms of the effect of anodic area increase as well as pH decrease and salt condensation within pits.

Journal

Citations (7)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top