Evaluation and improvement of pipeline coating performance

钢管暴露在潮湿的土壤或潮湿的空气中容易腐蚀，即成为阳极并被氧化。涂层在钢管表面和周围环境之间提供了物理和电化学屏障。选择和应用能够防止或减轻管道外部或内部表面腐蚀的适当涂层系统对于管道的长期完整性至关重要。在过去的几年里，当涉及到几个阿尔伯塔到潮汐的管道项目时，石油和能源部门的各种利益相关者特别提出了这种担忧。Shawcor有限公司有兴趣开发新的阴极剥离测试方法，以评估其外部涂层产品在岩石区域的性能，以及在可能与天然岩石氧化产生的酸（即硫化物）相互作用的区域。一种可靠的无损检测方法来测量阴极剥离也是肖克公司和整个管道行业的重要兴趣。Specialty Polymer Coatings, Inc.对开发一种经济可行的方法感兴趣，该方法可以使液体环氧涂层附着在三层涂层系统的聚乙烯层上，以解决现场接缝涂层的应用问题。加拿大主要的管道运营商和涂层涂抹者也希望评估管道内部涂层在长时间暴露于可能导致涂层脱落的水中后的性能，并找到防止水可能对涂层完整性带来负面影响的方法。****此提案描述了解决上述三个主题的实验计划。一名博士后和两名博士将分别在评估外部涂层和内部涂层的性能以及探索现场接头涂层的可行性和经济性方面进行研究工作。最终目标是通过产生新的方法来评估涂层性能，并提供新的标准来选择适合现场应用的涂层系统，从而促进这些利益相关者做出涂层选择决策。****

Steel pipes tend to corrode, i.e. become an anode and get oxidized, when exposed to moist soil or wet air. Coatings provide a physical and electrochemical barrier between the steel surface of the pipe and the surrounding environment. Selecting and applying appropriate coating systems capable of preventing or mitigating external or internal pipeline surface corrosion is critical for long-term pipeline integrity. This concern has specifically been raised by various stakeholders in the Oil & Energy sector when it comes to the several Alberta-to-tidewater pipeline projects in discussion over the last few years. Shawcor Ltd. is interested in developing new cathodic disbondment test method to assess the performance of its external coating products in rocky areas and where there is the potential for interaction with acid generated from the oxidation of natural rocks (i.e. sulphides). A reliable non-destructive test method to measure cathodic disbondment is also of significant interest to Shawcor and to the pipeline industry in general. Specialty Polymer Coatings, Inc. has interests in generating an economically feasible way to allow liquid epoxy coatings to adhere to the polyethylene layer of 3-layer coating systems as a solution to the problem of applying field joint coatings. Major Canadian pipeline operators and coating applicators also wish to evaluate the performance of pipeline internal coatings after prolonged exposure to water that might result in coating disbondment and to find ways to prevent the negative effect the water might bring to the coating integrity. ****This proposal describes the experimental plans to address the three topics described above. One postdoctoral and two PhD students will perform the research work on evaluating the performance of external and internal coatings, and exploring the feasibility and economics of field joint coatings, respectively. The ultimate goal is to facilitate these stakeholders in making coating selection decisions by generating new methods to assess coating performance and providing new criteria to select suitable coating systems for field application.****