In the paper,coating formation by an environmentally friendly process,which did not contain Cr~(6+),F~- and PO_4~(3-), was compared with a U.S.Patent.Coating surface obtained by the new process was smooth but distribution of pores was not uniform with several small pores in a large pore.However,the pore by the latter was round and uniform very much but the distance between pores was smaller than that by the former.Chemical compositions of anodic coatings by the two processes were different with the new proc...
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