摘要
湿热条件下进行大气腐蚀加速试验时,在金属试片表面覆盖一层镜头纸,由于纸质疏松造成的毛细作用,会产生有相当厚度、分布基本均匀并且易于控制重现的水膜。本文提出的这一方法大大缩短了腐蚀试验过程。
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.
出处
《中国腐蚀与防护学报》
CAS
CSCD
1990年第3期228-232,共5页
Journal of Chinese Society For Corrosion and Protection
基金
中国科学院腐蚀科学开放实验室课题
