Radial distribution function (RDF) of water in different conditions was studied by MD simulation with SPC/E water model. The results of RDFs between water oxygens and oxygens ( gOO( r) ) ) indicate that the nearest distance of water molecule is 0.25 nm. The first and second peaks of ( gOO( r) ) are in 0.28 nm and 0.45 nm which are the positions of first and second "water hull" respectively. The results of RDFs between water oxygens and hydrogens( gOO( r) )  indicated that the main distances of hydrogen bonds of water molecules are 0.18 nm. RDFs between water hydrogens and hydrogens( gOO( r) ) depended on the changes of hydrogen bonds of water molecules and( gOO( r) ) .

Different effects to the shear bond strength of epoxy adhesive coating in several surface treatment methods were studied in the experiments where mechanical processing, acid pickling, cold parkerizing process and coupling treatment methods were used. According to the experimental data, the relationship curve between the surface roughness and shear bond strength of epoxy adhesive coating was mapped, and a detailed theoretical analysis after comparing the test results was made. The results show that the two methods of cold parkerizing process and coupling treatment can improve the shear bond strength of epoxy adhesive coating significantly.