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研究了几种钝态金属在合有活性离子的中性缓蚀剂体系及硫酸体系中发生局部腐蚀时的电化学噪声行为。结果表明:在研究的所有腐蚀体系中,饨态表面孔蚀过程中腐蚀电位波动噪声的功率密度谱(SPD)曲线都具有相同特征,即在极低频率下为白噪声,随频率升高,逐渐转变为1/f~n 噪声。视金属材料不同,测得的表观 n 值在2.2—3.4之间。SPD 曲线上最高频率 f_c 与溶液中 Cl~-浓度关系呈现三种类型。提出了一个解释实验结果的 SPD 的数学模型.
The electrochemical noise behavior of several passive metals in the neutral corrosion inhibitor system with active ions and in the sulfuric acid system was investigated. The results show that the power density spectrum (SPD) curves of the corrosion potential fluctuation noise in all the corrosion systems studied have the same characteristics, that is, white noise at very low frequency. With the increase of frequency, Gradually into 1 / f ~ n noise. Depending on the material of the metal, the measured apparent n value is between 2.2 and 3.4. There are three types of relationship between the highest frequency f_c on the SPD curve and the Cl ~ - concentration in solution. A mathematical model of SPD to explain the experimental results is presented.