液抵抗補正矩形波電流分極法による鉄腐食速度の測定

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  • Measurements of the Corrosion Rate of Iron in Aqueous Solution by Means of A Square Wave Current Polarization with Compensation of Solution Resistance
  • エキ テイコウ ホセイ クケイハ デンリュウ ブンキョクホウ ニヨル テツ フ

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抄録

The corrosion rate of pure iron in aqueous solutions has been examined by a square wave linear polarization method as functions of solution pH, amount of oxygen dissolved in solution, and salt concentration. A square wave current with the pulse width of Δt=30s (frequency f=0.017Hz) was adapted to measure the apparent polarization resistance, Rp+Rs, and it was interrupted for a short time less than 0.1ms at an interval of 1ms to estimate the solution resistance, Rs. From the polarization resistance Rp the corrosion current ic of iron was estimated within 15% error in sulphate solutions in a wide range of pH from acid to alkali by using the following equation, ic=K/Rp with K=0.025(V). In sulphate solutions of 0.5mol kg-1[SO42-] under the air-opened condition, the corrosion current of iron decreases with pH in acidic solutions (pH<4), whereas in neutral solutions (4<pH<10) the corrosion current is independent of pH. In alkaline solutions (pH>10) iron becomes passivated. Both salt concentration and dissolved oxygen concentration in sodium sulphate solution influence the corrosion current. With increasing the concentration of sodium sulphate, the corrosion rate decreases in aerated and oxygenated solutions but it increases in deaerated solutions.

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