中文摘要：

对浪溅区不同位置处AISI4135钢试样表面的润湿状态随潮汐的变化进行了研究。结果表明：浪溅区试样表面润湿程度与位置和潮汐的变化有关,大体上呈随潮位升高润湿程度加大,随潮位降低润湿程度降低的变化趋势。但在同一时刻试样的润湿状态与潮位和试样的位置关系具有不确定性,试样的润湿程度随暴露天数的增加有增强的趋势。浪溅区由于飞溅的海水泡沫的作用及较高的空气湿度,即使在低潮区仍然处于湿润状态,这与腐蚀产物有较高的吸湿特性有关。碳钢在浪溅区腐蚀速率的极值点对应一特定的润湿程度,在极值点以下常能观察到由于浪花飞溅、水汽凝结出现的肉眼可见液膜,这和金属腐蚀速率与表面液膜厚度的关系相一致。

英文摘要：

The corrosion rate of steels in marine splash zone is high, and it is generally considered to be due to the environmental characteristics of this zone. One of the important distinctions between the marine splash zone and the normal atmospheric zone is the wetting condition of steel surfaces. However even in the same splash zone, the corrosion rate of one spot is different to that of the other ones on the surface of one steel pile, thereby on which a corrosion rate peak should exist at a specific spot. In order to reveal the nature of the difference in corrosion rate at different positions of a steel pile, the variations of the wetting condition of steel specimens with tidal movement was monitored, while the specimens located at different positions along a vertical line passing the tide zone. It follows that the wetting degree of the steel specimen in the splash zone is closely related with its location and the tidal movement, and which substantially follows an overall trend that the wetting degree increases with the rising tide level and decrease with the lowering tide level; the wetting degree of the steel specimen increases with the increase of exposure time. But for a specificmoment, a certain relationship dose not exist for the wetting degree with the tide movement and the location of steel specimen. Even though by the time of the low tide level the steel specimen located in splash zone is still in a wet condition due to the effect of the high air humidity and flying seawater foam, which correlates also to the high moisture absorption characteristics of corrosion products scale on the carbon steel. The extreme corrosion rate of the steel in splash zone corresponds to a specific wetting degree. Furthermore, on the area below the extreme point, thin water film on the surface of steel specimens can often be observed by naked eyes, which is consistent with the relationship between corrosion rate and thickness of liquid film on the metal surface.