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| A NEW APPROACH TO ACCELERATE ATMOSPHERIC CORROSION TEST |
| Xu Naixin Zhang Chengdian and Ding Cuihong (Shanghai Institute of Metallurgy;Academia Sinica) |
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Abstract Atmospheric corrosion test in laboratory is usually performed in a humidity cabinet to shorten the test duration.The main purpose of the new approach is to further increase severity of corrosion environment by means of promotion of water condensation on specimen surface.It is based on the exposure of lens-paper-covered specimens in humidity cabinet.Lens paper consists of long fibre with loosely netted texture. The capillarity of lens paper facilitates more water condensation from humid environment.Moreover,in the presence of lens paper, condensed water will spread out immediately instead of forming into drops.Vertical suspension of the specimen makes it easy to drain excessive water.As a result,a rather thick,uniform and reproducible water layer could be maintained on specimen surface.In water vapor saturated environment at 50℃,the thickness of such a water layer is typically about 40um.Experiments indicate that by means of such a simple arrangement,corrosion of specimen is significantly enhanced. Weight loss of bare mild steel specimen covered with lens paper is of an order of magnitude greater than that without it.The additional advantage of this new approach is that the rust stained lens paper after exposure could be reserved as permanent record of corrosion characteristics.
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Received: 25 June 1990
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[1] 托马晓夫,H.Ц.,金属腐蚀及其保护的理论,华保定等译,中国工业出版社,北京,1964,P251-252
[2] GB2361-80,防锈油脂湿热试验方法
[3] ASTM D1748-83,Standard Test Method for Rust Protection by Metal Preservatives in the Humidity Cabinet.
[4] 周静妤编著,防锈技术,化学工业出版社,1988,P126
[5] JB 3206-83,防锈油脂加速凝露腐蚀试验方法 |
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