Explain the role of each of the following in promoting corrosion: moisture, electrolytes, and acids. Match the words in the left column to the appropriate blanks in the sentences on the right. Reset Help diminishes Moisture must be present for corrosion to occur. The presence of water is necessary because water oxidation is a reactant in many reactions and because charge must be free to flow between the anodic and cathodic regions. The presence of an electrolyte on the surface of a metal slower corrosion because it current flow. The presence of acids reduction + corrosion. Since H+ ions are involved in the of oxygen, lower pH faster leads to corrosion. enhances