To solve the problem of "short life span and high maintenance cost"of anti-corrosion coating ,the influencing factors on the bonding strength of anti-corrosion Coating-steel interface were analyzed .The variation of bond strength between coating and steel under different sediment contents was discussed ,and obtained the Coating-steel interface strength weakened mechanism . The results show :1)Coating water absorption ,coating wet adhesion ,coating thickness ,coating porosity can have a significant impact on the coating-steel interface bonding strength .The increase of the coating thickness will reduce the cohesion of the coat-ing .The larger the porosity of the coating ,the more easily the corrosive medium will penetrate into the coating-steel interface , causing the corrosion reaction .2)Under the conditions of sandy ,with the increase of the flow rate ,the tendency of the coating adhesion decreased obviously ,and the maximum value of the adhesion decreased gradually from the angle of 0° to the angle of 45° .Under the low sand condition ,the overall decline in coating adhesion shows a similar trend as the coating in static water .3) The coating-steel interface weakening process can be roughly divided into three stages of "slow-accelerating-slowing down",it is similar to the tendency of the coating surface damage .%为解决内河码头中水工钢构件防腐涂层寿命短、维护成本高的问题,分析防腐涂层-钢界面结合强度弱化影响因素,探讨多沙与低沙条件下涂层-钢界面结合强度变化规律,得出防腐涂层-钢界面强度弱化机理.结果表明:1)涂层吸水率、涂层湿附着力、涂层厚度、涂层孔隙率都能涂层-钢界面结合强度产生明显的影响.涂层厚度的增加会使涂层内聚力减小;涂层孔隙率越大,腐蚀介质就越容易渗透到涂层-钢界面,引起腐蚀反应,导致涂层起泡、脱落;2)多沙条件下,随着水流速度的增大,涂层附着力整体下降趋势越明显,其附着力最大下降值逐渐由0°冲角向45°冲角偏移;低沙条件下,涂层附着力表现出的总体下降趋势与涂层在静态水的下降趋势相似;3)涂层-钢界面弱化过程大致分为"缓慢-加速-减缓"3个阶段,与涂层表面损伤趋势相似.
展开▼
