As it becomes more important to go from fossil fuels to alternative fuels, biofuels like ethanol are becoming more commercially used. The increased use of ethanol brings good influences such as lower impact on the environment. However, the use of ethanol can also bring negative effects regarding corrosion of metals. In the automotive industry aluminium has been seen affected of a new aggressive corrosion problem, alcoholate corrosion. This study has looked into parameters of alcoholate corrosion; water, temperature, time and pressure. Aluminium alloys AA6063 and A380 have been used and five different surface treatments of AA6063 have been tested to observe if they inhibit the effect of alcoholate corrosion. Throughout the experiments the water dependence of alcoholate corrosion has showed to be of great importance. An increase in water content will postpone the start of alcoholate corrosion or prevent the corrosion to occur. A correlation between temperature and time has been observed. Higher temperatures give a shorter time period of exposure before alcoholate corrosion occurs, and lower temperatures give longer time periods. The effect of different pressures has been studied and shows no effect on alcoholate corrosion when using pressurisation with the inert nitrogen gas. All of the surface treatments have showed to help protect the aluminium alloy against alcoholate corrosion. The electroless nickel plating seems to prevent alcoholate corrosion while Keronite coating seems to be sensitive to this form of corrosion