Application of selective dissolution of intermetallic particles on aluminum surface as a surface treatment

It is known that the more FeAl 2 intermetallic compound particles usually exhibited onaluminum are more detrimental to corrosion.自这个钢铁元素hardly dissolves in aluminummatrix as a solid solution, iron forms an intermetallic compound such as FeAland disperses in the matrix. An effective surface treatmentby which preferential removal of FeAl D2particles from the aluminum surface can proceedA proposed treatment是电子surface treatment that the electrochemical surface treatmentspecimen is kept in the potential of-2.0 vvs . ag / agcl for 1000s and quickly then held at thepotential of 0.0 vvs . ag / agcl for more over 1000s in 0.1kmol / m - 1-3 - d - 1 Al(NO - D23 - D2) - D23 - D2solution. Appreciable FeAl - D23 -particle-ftee surface was obtained by this treatment.Furthermore, in order to get a perfect particle-free surface of the aluminum matrix，a简单和有效的电子treatmentby which selective removal of FeAl D23 D2can proceed，has been developed in trial and error. It is found that FeAl D23 -free surface is obtained by acathodic treatment (-2.0 vvs . age / agcl for more than 1000s) in 17mass% HNO D23 D2 solution as theone of most successful techniques. We obtained perfect compound-free aluminum surface by thismethod. Mentioning above proposed the one of the effective surface treatment technologies and willhelp the aluminum recycle system when the recycle aluminum will be used from the cascade-use to theproper use （so-called products-to-products use）

It is well known that the more FeAlィイD23ィエD2 intermetallic compound particles usually exhibited on aluminum are more detrimental to corrosion. Since this iron element hardly dissolves in aluminum matrix as a solid solution, iron forms an intermetallic compound such as FeAlィイD23ィエD2, and disperses in the matrix. An effective surface treatment, by which preferential removal of FeAlィイD23ィエD2particles from the aluminum surface can proceed, has been investigated. A proposed treatment is the electrochemical surface treatment that the specimen is kept in the potential of-2.0V vs.Ag/AgCl for 1000s and quickly then held at the potential of 0.0V vs.Ag/AgCl for more over 1000s in 0.1kmol ・ mィイD1-3ィエD1 Al(NOィイD23ィエD2)ィイD23ィエD2 solution. Appreciable FeAlィイD23ィエD2-particle-ftee surface was obtained by this treatment. Furthermore, in order to get a perfect particle-free surface of the aluminum matrix, a simple and effective electrochemical treatment, by which selective removal of FeAlィイD23ィエD2can proceed, has been developed in trial and error. It is found that FeAlィイD23ィエD2-free surface is obtained by a cathodic treatment (-2.0V vs.Ag/AgCl for more than 1000s) in 17mass% HNOィイD23ィエD2 solution as the one of most successful techniques. We obtained perfect compound-free aluminum surface by this method. Mentioning above proposed the one of the effective surface treatment technologies and will help the aluminum recycle system when the recycle aluminum will be used from the cascade-use to the proper use (so-called products-to-products use).