Evaluation of metal structures has long relied on atmospheric exposure sites to determine corrosion resistance in marine environments. This approach is an invaluable method to predict the service life of metallic materials. The primary disadvantage to this approach is the long times required for evaluation often lasting 3 to 5 years. Traditional accelerated corrosion testing relies on mimicking atmospheric exposure conditions but their success in correlation to atmospheric exposure is often a concern because timescales are difficult to relate. Although visual and mass loss methods of evaluating corrosion are the standard and their use is imperative a method that correlates timescales from atmospheric exposure to accelerated testing based on the chemical changes that occur during corrosion would be very valuable. This work makes use of surface and electrochemical techniques to interpret the chemical changes occurring on steel substrates during atmospheric and accelerated corrosion conditions. The latest findings obtained by analyzing data from four marine-based corrosion conditions that include exposure at the Kennedy Space Center Beachside Atmospheric Exposure Test Site alternating seawater submersion salt fog and laboratory-scale electrochemically induced corrosion will be presented.