摘要
为了在2024铝合金表面获得结合力好、耐候性好及黑色纯正的阳极氧化膜,首先在硫酸电解液中对2024铝合金进行阳极氧化,之后在Sn-Ni-Cu-Co电解液中进行电解着黑色,采用SEM,XRD,EDS分析膜层的表面形貌、截面特征、成分及膜中的元素分布,优选了阳极氧化、电解着色电解液的成分;从金属颗粒沉积、氧化还原方面分析了电解着色的机理。结果表明:最佳阳极氧化液配方为100.0 g/L H2SO4,5.0 g/L H3BO3,2.0 g/L(NH4)2SO4,2.0 g/L苹果酸,2.0 g/L MgSO4,1.5 g/L Al2(SO4)3;最佳着色液配方为15 g/L SnSO4,10 g/L NiSO4,10 g/L CuSO4,10 g/L C4H6O4Co,3 g/L FeSO4;在Sn-Ni-Cu-Co电解着色液中,Sn2+,Co2+,Cu2+等通过还原反应以单质的形式沉积于氧化膜层的孔隙或底部,通过多重散射使氧化膜颜色加深,从而得到了黑色的氧化膜;最佳氧化膜颜色为石墨黑,结合力及耐候性均较好。
2024 Al alloy was anodized in sulfunc acid electrolyte and then electrolyzed in Sn-Ni-Co-Cu electrolyte to allow blackening affording anodizing film.The surface and cross- section morphologies of as- obtained surface film were analyzed with a scanning electron microscope,while its phase structure and composition were determined by Xray diffraction and energy dispersive spectrometry.The compositions of the anodizing solution and electrolysis coloring solution were optimized,and the electrolysis coloring mechanism was analyzed with respect to the deposition of metallic particulates and oxidation-reduction reactions.Results indicated that the anodizing solution with the optimal composition consisted of 100.0 g/L H_2SO_4,5.0 g/L H_3BO_3,2.0 g/L(NH_4)_2SO_4,2.0 g/L malic acid,2.0 g/L MgSO_4 and 1.5 g/L Al_2(SO_4)_3;and the coloring solution with the optimal composition consisted of 15 g/L SnSO_4,10 g/L NiSO_4,10 g/L CuSO_4,10 g/L C_4 H_6O_4 Co and 3 g/L FeSO_4.In the Sn-Ni-Co-Cu electrolysis coloring solution,Sn^(2+),Co^(2+) and Cu^(2+)underwent oxidation- reduction reactions and were deposited as relevant metals in the pores or at the bottom of the oxidation film,and the deposited metals contributed to deepening the color of the oxidation film by way of multiple scattering thereby affording black oxidation film.The oxidation film obtained under the optimal conditions was of graphite-like blackness and exhibited good adhesion to substrate as well as good weather resistance.
出处
《材料保护》
CAS
CSCD
北大核心
2014年第7期42-44,47,共4页
Materials Protection
