Electrochemical characterization of a zinc rich epoxy nano-coating primer on an X52 steel pipeline grade in flow conditions

摘要

Internal corrosion protection of pipelines in oil and gas production includes chemical inhibitors that are added to the transported product. Although effective, some chemicals forming the inhibitor mixture might constitute an environmental hazard. Recently, environmental friendly solutions have been proposed as alternative route for corrosion prevention and protection, such as coatings.rnThis present research aims the characterization of a zinc-rich epoxy nano coating primer (ZREP) by electrochemical impedance spectroscopy (EIS) under rotating cylinder electrode (RCE) conditions. X52 API steel samples were tested at different rotational rates in chloride solution at room temperature. The behaviour of the nano structures is influenced when are exposed to saturated CO_2 and NaCl 3%wt. electrolytes. Electrochemical characterization of the nano structure architectures was performed by monitoring the coating/substrate/electrolyte interface in real time assuming steady state conditions. The electrochemical testing, high surface resolution techniques and characterization methods comprise the multi-scale theoretical tools that compare the performance of the substrate/coating interface with the physical characteristics (thickness and composition) of the primer layer.