Within the oil and gas industry internal corrosion due to CO2 saturated solutions is a widespread issue. On this basis significant effort has been applied to gain mechanistic insight into such sweet corrosion including elucidation of the composition and structure of corrosion scales. There is however currently limited published work regarding in situ measurement of scales which is the focus of the current work. To this end an electrochemical cell (E-cell) has been designed and constructed allowing electrochemical measurements and in situ synchrotron radiation (SR) based grazing incidence x-ray diffraction (GIXRD) to be undertaken from the same sample. This SR E-cell can be deaerated and the solution temperature elevated up to ~ 80°C. Experimental data acquired using this cell at the XMaS beam line of the ESRF (France) from X-65 pipeline steel immersed in CO2 saturated salt solution will presented. Results will be compared to ex situ GIXRD data.