In general, for aluminum alloy parts, it is easy to judge whether the aluminum alloy is corroded or not. It can be visually observed. Because the aluminum alloy used on the aluminum alloy ship is corroded in the marine environment, corrosion products will appear. It is white floc or powder, and its main component is aluminum oxide or aluminum oxide, and a small amount of magnesium oxide.
Corrosion under the coating is not easily found in the early stage of corrosion. When the corrosion develops to a certain stage, the corrosion product under the coating is judged by the coating drum or rust.
In addition, aluminum alloy parts that cannot be visually observed may be indirectly judged by potential measurement. If the aluminum alloy parts are not rained and other metal is connected, and there is no chemical protection, once the occurrence of obvious self-corrosion occurs, the corrosion potential is much lower than that in the stewed state, but when the measurement finds that the potential is negative, the part and activation are indicated. Corroded.