Evaluation and improvement of pipeline coating performance

当钢管暴露在潮湿的土壤或潮湿的空气中时，容易腐蚀，即成为阳极并被氧化。涂层在管道的钢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管道的长期完整性至关重要。石油和能源部门的不同利益攸关方在过去几年讨论的几个艾伯塔省至潮水管道项目时，特别提出了这一关切。ShawCor Ltd.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地区以及可能与天然岩石(即硫化物)氧化产生的酸相互作用时的性能。一种可靠的非破坏性测试方法来测量阴极剥离也对ShawCor和整个管道行业具有重要意义。特种聚合物涂料公司对开发一种经济上可行的方法感兴趣，这种方法允许液体环氧涂料附着在三层涂料系统的聚乙烯层上，以解决现场连接涂料的问题。加拿大主要的管道运营商和涂层涂覆者也希望评估管道内涂层在长时间暴露在可能导致涂层剥离的水中后的性能，并找到防止水可能对涂层完整性带来的负面影响的方法。 本提案描述了处理上述三个专题的试验计划。一名博士后和两名博士后将分别进行外部和内部涂层性能评估的研究工作，并探索现场连接涂层的可行性和经济性。最终目标是通过制定评估涂层性能的新方法和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.