In order to obtain a more protective phosphate conversion coating with a denser architecture,the nucleation kinetics of phosphate chemical conversion coating on Mg-Gd-Y-Zr magnesium alloy was tuned in this work.A pret...In order to obtain a more protective phosphate conversion coating with a denser architecture,the nucleation kinetics of phosphate chemical conversion coating on Mg-Gd-Y-Zr magnesium alloy was tuned in this work.A pretreatment process was proposed and organic additives were incorporated,which aims at increasing the ionic produce(J_(sp))at the interface for increasingσ,and decreasing the critical ionic product(J_(C,sp)),respectively.Results prove that the pretreatment of bare alloys in a phosphate bath could increase the ion products of MgHPO_(4)/MnHPO_(4).The addition of benzalkonium chloride could neutralize the charges of crystals,and in turn promote the nucleation kinetics.A denser and more protective conversion coating could consequently be obtained.展开更多
基金the National Natural Science Foundation of China(No.52201066 and No.U21A2045)LiaoNing Revitalization Talents Program(NO.XLYC2002071)+2 种基金Gratitude is also expressed to the support from the Shanghai Aerospace Science and Technology Innovation Fund(SAST2020-046)the Fundamental Research Funds for the Central Universities(N2224002-21)the Natural Science Foundation of Shanghai(20ZR1424200).
文摘In order to obtain a more protective phosphate conversion coating with a denser architecture,the nucleation kinetics of phosphate chemical conversion coating on Mg-Gd-Y-Zr magnesium alloy was tuned in this work.A pretreatment process was proposed and organic additives were incorporated,which aims at increasing the ionic produce(J_(sp))at the interface for increasingσ,and decreasing the critical ionic product(J_(C,sp)),respectively.Results prove that the pretreatment of bare alloys in a phosphate bath could increase the ion products of MgHPO_(4)/MnHPO_(4).The addition of benzalkonium chloride could neutralize the charges of crystals,and in turn promote the nucleation kinetics.A denser and more protective conversion coating could consequently be obtained.
