AP1000核电站空气导流板用高锰铝合金的阳极氧化

Anodization of high-manganese aluminum alloy for air baffle used in AP1000 nuclear power station

采用硫酸体系对AP1000非能动核电站空气导流板用5454-H32高锰铝合金进行阳极氧化。研究了硫酸质量浓度、温度、电流密度和氧化时间对氧化膜性能的影响,得到较优的工艺参数为:硫酸质量浓度170～180 g/L,温度14～18°C,采用在1.2～1.4 A/dm^2的高电流密度下持续180 s后再在0.13 A/dm^2的低电流密度下持续10 s的单向脉冲波形,总氧化时间30～40 min。在该工艺下所得氧化膜的厚度、耐蚀性、导热性等均满足核电站的运行要求。

High-Mn aluminum alloy 5454-H32 used for making air baffles of AP1000 nuclear power station was anodized in H2SO4 electrolyte.The effects of H2SO4 mass concentration,temperature,current density,and anodization time on the properties of anodization film were studied.A unidirectional pulse waveform,i.e.high current density 1.2-1.4 A/dm^2 for 180 s followed by low current density 0.13 A/dm^2 for 10 s,was applied.The other optimal process parameters were determined as follows:H2SO4 170-180 g/L,temperature 14-18℃,and anodization time 30-40 min.The thickness,corrosion resistance,and thermal conductivity of the oxidation film obtained under the said conditions meet the operation requirements of nuclear power station.