Working conditions:seafood processing plant, the environment isrelatively humid,seawater cleaning seafood,seawater corrosivity is relatively strong, resulting inserious corrosion of the vehicle, parts and components of the early failure, the normal use of the whole machine cycle in 2 years orso, about 4 years of corrosion andscrapping. (Cold storage, chemical plants, fertilizer factories and other working conditions, the same harsh operating environment)