Alloy UNS N07718, commercially known as Alloy 718, is the most applied nickel alloy in the oil and gas industry. It is mainly composed by nickel, chromium and iron with additions of molybdenum, niobium, titanium and aluminum, the last three elements being responsible for the precipitation of the hardening phases gamma prime and gamma double prime, which make this alloy a good option when high strengths are required. Its high corrosion resistance is primarily due to its elevated nickel and chromium contents. Nitrides, carbides and carbo-nitrides might form during the manufacturing process, and oxides, borides and sulfides can be seen in a less extension. It is known that each precipitate interacts with the matrix and the oxide protective film, but there is a lack of studies related to the mechanisms occurring during the initiation of localized corrosion. In this paper, we present first results of a study related to pitting formation in UNS N07718 in chloride-containing solution and the evolution of the first corrosion steps.