钢筋混凝土实际海洋环境下的腐蚀

目的研究钢筋混凝土在实际海洋环境中的腐蚀行为。方法记录浸泡在青岛水域1 a时间内钢筋混凝土表面生物的附着情况,并通过XRD等测试手段分析海洋环境中的污损生物对混凝土基体表面组分腐蚀行为的影响。通过测试氯离子含量,监测钢筋在实际海洋环境下的临界氯离子含量,同时通过动电位极化,比较钢筋在海水中腐蚀1 a的点蚀电位和极化电阻等电化学参数,通过SEM观察钢筋表面腐蚀形貌,监测钢筋的腐蚀情况。结果海洋污损生物导致重金属元素在混凝土表层富集,钢筋混凝土在实际海洋环境下的临界氯离子含量为0.375%,钢筋混凝土在实际海洋环境下180 d钝化状态消失,产生局部腐蚀。结论海水中的生物主要是对混凝土表层的物质产生了影响,但并未对钢筋的腐蚀产生影响。导致钢筋产生腐蚀的主要因素在于氯离子的渗透。

Corrosion of Reinforced Concrete in Marine Environment

The paper aims to research the corrosion behavior of reinforced concrete in real marine environment. In this paper, the attachment of organisms on the surface of reinforced concrete immersed in seawater of Qingdao for one year was recorded, and the influences of fouling organism in marine environment on corrosion of the concrete matrix were tested and analyzed by means of XRD, etc. The critical chloride ion content of rebar in marine environment was monitored by measuring the chloride ion content. Simultaneously, the electrochemical parameters such as pitting potential and polarization resistance of steel bar immersed in seawater for one year was tested by potentiodynamic polarization. The corrosion morphology of rebar was observed by SEM to monitor the corrosion of the rebar. Marine fouling organisms resulted in the enrichment of heavy metal elements; the critical chloride ion content of reinforced concrete in the actual marine environment was 0.375%; the passivation state of reinforced concrete disappeared in the actual marine environment for 180 days, resulting in local corrosion. The organisms in seawater mainly affect the surface material of concrete, but have no effect on the corrosion of rebar. The main reason for the corrosion of rebar is the penetration of chloride ions.