LEAK ANALYSIS OF THE GASOLINE FILTER

Gasoline filter was found leak after 24 whole vehicle cycles test. Leak reason was analyzed by macro-examination,microstructure examination,SEM and energy spectrum analysis,and the results showed that crevice corrosion and galvanic corrosion were the main reason for the leak. Crevice corrosion took place in early stage between the crevice of the filter′s tank and bracket,which resulted in pitting of the filter′s tank and falling of the zinc coating of the filter′s bracket. Then galvanic corrosion happened because of the different electrode voltage of the bracket basal body and the tank,which speed up the corrosion of the tank and led to the leak of fuel filter only after 24 cycles test.