在3％NaCl、006％NaCl和自来水3种实验介质中，研究了Q 235钢的方波脉冲电流幅值(I\-A)、频率(f)和占空比(P)的变化对于阴极极化 电位(E)和极化幅度(ΔE)的影响规律.结果表明，E和ΔE随方波I\-A 、f和P的增加而变负，但当E接近或负于-100 V(SCE)时，再增加各电流参数的值， E和ΔE的负移程度都大大减小.各电流参数对ΔE的影响程度不同，并与E值 密切 相关.提出调整电流参数总的原则和方法是：在达到所要求的保护效果的前提下，尽可能采 用低P、低IA的电流参数，并优先调整f,再调整I\-A.
Effects of the square wave pulsed current(SWPC) par ameters i.e. frequency (f),magnitude(IA) and duty cycle(P) on the cathodic polarization potentials(E) and polarization extents(ΔE) of the Q235 steel electrodes were studied in 3%NaCl,0.06%NaCl and tap water.The result s show that E and ΔE change negatively with the increase of IA, f and P,but if E is close or more negative than -1.00V(SCE),the change of E and ΔE will decrease largely.The effects of each current parame ters on ΔE are different and relate closely to E.The general principle and method to adjust the current parameters are indicated that on the basis of a chieving an expected protection status,the SWPCs with lower P and IA a re recommended,and if the current parameters need to be adjusted,firstly frequen cy is adjusted and then IA.
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