Relationship between corrosion rate of carbon steel and water film thickness under thin layer of artificial sea water

被引：18

作者：

Katayama, H ^{[1
]}

Noda, K ^{[1
]}

Yamamoto, M ^{[1
]}

Kodama, T ^{[1
]}

机构：

[1] Natl Res Inst Met, Frontier Res Ctr Struct Mat, Tsukuba, Ibaraki 3050047, Japan

来源：

JOURNAL OF THE JAPAN INSTITUTE OF METALS | 2001年 / 65卷 / 04期

关键词：

alternating current impedance technique; steel; atmospheric corrosion; corrosion monitoring; relative humidity;

D O I：

10.2320/jinstmet1952.65.4_298

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

AC impedance method has been applied to atmospheric corrosion monitoring under thin Nm of artificial seawater. An atmospheric corrosion sensor, which consists of a pair of identical electrodes embedded concentrically in epoxy resin, was used for measuring the corrosion rates. The instaneous corrosion rates of carbon steel in the atmosphere of 60% to 95% Relative Humidity (RH) have been monitored by the continuous measurements of the impedance at 10 mHz and 10 kHz. The carbon steel under a thin mater film including 0.1 kg/m(2) salt showed the highest corrosion rate at 60%RH. Above 70%RH, however, the carbon steel under a liquid thin film including 0.01 kg/m(2) salt gave the largest corrosion rate. The average thickness of a water film formed on the corrosion sensor was thermodynamically calculated by analyzing the drying and absorption processes of the artificial sea salt. The average thickness of water film formed on the corrosion sensor under film including 0.01 kg/m(2) salt was 10 similar to 100 mum above 70%RH. The corrosion rate of carbon steer showed a maximum at the average water film thickness of several 10 s of micrometers.

引用

页码：298 / 302

页数：5

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