무기징크 도료에서의 亞鉛 含量에 따른 防蝕性能 硏究

Abstract

Abstract

Inorganic coating are widely used to control the corrosion of metal. The main function of anticorrosive coating is to prevent corrosive agents, such as water or oxygen, from contacting the underlying metal substrate. In addition, the inorganic coating function as high resistance between anode and cathode of local corrosion cell. The anticorrosive performance of inorganic coating can be obtained by the functions of binder and pigment, and latter is known to be more important. Inorgainc zinc-rich primer, top coat(epoxy) were tested on their electrochemical characteristics with EIS. First, ethyl silicate and zinc wt.% Content by applying a primer, and then was applied followed by a subsequent epoxy. Zinc content in order to study the characteristics of the cathodic protection to the open circuit potentials were measured, and the corrosion protection coating system to study the performance of the AC impedance was measured. Artificial sea water immersion test and continuous neutral salt spray test were conducted find out deteriorations of the coating system during 40 days. In addition, corrosion potentials of zinc-rich were measured to figure out whether the steel was cathodic protected. As a result, the passage of time according to an accelerated aging test as applied to inorganic zinc-rich primer according to the increase in the zinc content of the cathodic protection coating system characteristics and the correlation between could research.

Keyword : inorginc coating, zinc-rich primers, electrochemical properties. EIS, corrosion potential