CN107739929B - 一种高耐候性铝合金及其制备方法 - Google Patents
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Abstract
本发明公开了一种高耐候性铝合金及其制备方法,属于高性能铝合金材料技术领域。本发明在铝合金中添加由Y2O3、La2O3和CeO2构成的稀土粉末并结合特定条件下的热处理工艺明显提高了铝合金的耐腐蚀性能;同时,本发明在进行活化处理后铝合金表面涂覆含有稀土盐的涂层,使得涂层与铝合金表面以相互嵌入的方式紧密结合,而不是仅覆于铝合金表面,而且由于涂层中也含有稀土元素,进一步提高了铝合金的耐候性。
Description
技术领域
本发明涉及高性能铝合金材料技术领域,具体涉及一种高耐候性铝合金及其制备方法。
背景技术
铝合金由于具有密度小、比强度高、导电导热性能优良、塑性好、机械加工性能好等优点广泛应用于轻工、建材、航天航空等领域。尤其是由于其质轻,在航天航空领域应用更为广泛。但是由于高空飞行环境变幻莫测,空气湿度、温度、腐蚀物质对铝合金的损害较大,因此,如何提高铝合金耐候性成为目前面临的技术难题。
发明内容
本发明的目的在于提供一种高耐候性铝合金及其制备方法,以解决现有铝合金耐候性较差的问题。
本发明解决上述技术问题的技术方案如下:
一种高耐候性铝合金制备方法,包括:
(1)将铝合金粉置于熔炉中,升温至1000-1200℃使其熔化,保温15-20min,然后加入占铝合金粉重量比为0.65-0.8%的稀土粉末,继续升温至1400-1500℃,在800-1000r/min的条件下搅拌20-30min并保温30-45min,将熔炉温度降至745-750℃后浇铸,制得铝合金铸锭,其中,所述稀土粉末为重量比为3:4:7的Y2O3、La2O3和CeO2构成的混合物;将铝合金铸锭进行400℃/12h+460℃/12h的双级均匀化处理,并对铝合金铸锭进行多次轧制处理,再在465℃的条件下固溶处理60min,然后淬火,将淬火后的铝合金铸锭置于干燥箱中在120℃的条件下时效处理24h,制得铝合金粗品;
(2)将所述铝合金粗品浸入至由21.5mmol/L的AlCl3和0.86mol/L的尿素构成的混合溶液中,在155-160℃的条件下反应3-3.5h,清洗后在4.5mmol/L的硬脂酸乙醇溶液中浸泡1.5-2h,清洗后烘干,制得活化铝合金;
(3)将白醇酸和稀释剂混合均匀后加入浓度为30g/L的二苯基磷酸溶液并混合均匀,制得磷化溶液,其中,白醇酸、稀释剂和二苯基磷酸溶液的质量比4:1:0.6,稀释剂由40wt%的乙酸乙酯、10wt%的正丁醇、10wt%的乙醇、10wt%的丙酮和30wt%的二甲苯构成;向所述磷化溶液中按照质量分数为1.2%的比例加入硝酸镧溶液,混合均匀,制得涂层原料;
(4)将步骤(2)制得的活化铝合金置于步骤(3)制得的涂层原料中浸渍3-5次,每次浸渍10-15min,每次浸渍完成后取出并自然阴干,然后再进行下一浸渍,待浸渍完成后在45℃的条件下固化4-5h,制得高强度高耐候性铝合金。
进一步地,在本发明较佳的实施例中,上述铝合金粉为Al-Zn-Mg-Cu系铝合金。
进一步地,在本发明较佳的实施例中,上述Al-Zn-Mg-Cu系铝合金包括按重量百分比计的以下组分:Zn 10.82%,Mg 3.03%,Cu 1.45%,Cr 0.12%,Zr 0.26%,Mn 0.24%,余量为Al。
上述的制备方法制备得到的高耐候性铝合金。
本发明具有以下有益效果:
本发明在铝合金中添加由Y2O3、La2O3和CeO2构成的稀土粉末并结合特定条件下的热处理工艺明显提高了铝合金的耐腐蚀性能;同时,本发明在进行活化处理后铝合金表面涂覆含有稀土盐的涂层,使得涂层与铝合金表面以相互嵌入的方式紧密结合,而不是仅覆于铝合金表面,而且由于涂层中也含有稀土元素,进一步提高了铝合金的耐候性。
本发明在铝合金粉中添加由Y2O3、La2O3和CeO2构成的稀土粉末,由于三种稀土粉末在铝合金中固溶度较小,容易富集在晶界处,增大了固-液界面前沿的成分过冷,缩小了合金的二次枝晶间距,而且由于Y2O3、La2O3和CeO2比较活泼,容易在晶粒和合金液之间形成表面膜,阻止合金晶粒长大,达到细化晶粒的目的,从而提高铝合金强度。
本发明通过将铝合金浸入至由21.5mmol/L的AlCl3和0.86mol/L的尿素构成的混合溶液中,在155-160℃的条件下反应3-3.5h,清洗后在4.5mmol/L的硬脂酸乙醇溶液中浸泡1.5-2h,在铝合金表面构筑处纳米结构,在金属表面形成均匀的孔洞和洞穴结构,为涂层浸润提供了足够的浸润空间,使得涂层与合金结合更加紧密。并且本发明对铝合金进行活化处理的反应温度较低、反应热应力小、反应可控、操作简单。
本发明在耐腐蚀涂层原料中稀土元素,提高了整个涂层的自腐蚀电位,提高了涂层本身的耐腐蚀性,从而提高了整个铝合金的耐候性。
具体实施方式
以下结合实施例对本发明的原理和特征进行描述,所举实例只用于解释本发明,并非用于限定本发明的范围。实施例中未注明具体条件者,按照常规条件或制造商建议的条件进行。所用试剂或仪器未注明生产厂商者,均为可以通过市售购买获得的常规产品。
本发明实施例的铝合金粉优选为Al-Zn-Mg-Cu系铝合金,包括按重量百分比计的以下组分:Zn 10.82%,Mg 3.03%,Cu 1.45%,Cr 0.12%,Zr 0.26%,Mn 0.24%,余量为Al。
实施例1:
本实施例的高耐候性铝合金制备方法,包括:
(1)将铝合金粉置于熔炉中,升温至1000℃使其熔化,保温20min,然后加入占铝合金粉重量比为0.65%的稀土粉末,继续升温至1400℃,在800r/min的条件下搅拌30min并保温45min,将熔炉温度降至745℃后浇铸,制得铝合金铸锭,其中,所述稀土粉末为重量比为3:4:7的Y2O3、La2O3和CeO2构成的混合物;将铝合金铸锭进行400℃/12h+460℃/12h的双级均匀化处理,并对铝合金铸锭进行多次轧制处理,再在465℃的条件下固溶处理60min,然后淬火,将淬火后的铝合金铸锭置于干燥箱中在120℃的条件下时效处理24h,制得铝合金粗品;
(2)将所述铝合金粗品浸入至由21.5mmol/L的AlCl3和0.86mol/L的尿素构成的混合溶液中,在155℃的条件下反应3.5h,清洗后在4.5mmol/L的硬脂酸乙醇溶液中浸泡1.5h,清洗后烘干,制得活化铝合金;
(3)将白醇酸和稀释剂混合均匀后加入浓度为30g/L的二苯基磷酸溶液并混合均匀,制得磷化溶液,其中,白醇酸、稀释剂和二苯基磷酸溶液的质量比4:1:0.6,稀释剂由40wt%的乙酸乙酯、10wt%的正丁醇、10wt%的乙醇、10wt%的丙酮和30wt%的二甲苯构成;向所述磷化溶液中按照质量分数为1.2%的比例加入硝酸镧溶液,混合均匀,制得涂层原料;
(4)将步骤(2)制得的活化铝合金置于步骤(3)制得的涂层原料中浸渍3次,每次浸渍15min,每次浸渍完成后取出并自然阴干,然后再进行下一浸渍,待浸渍完成后在45℃的条件下固化4h,制得高强度高耐候性铝合金。
实施例2:
本实施例的高耐候性铝合金制备方法,包括:
(1)将铝合金粉置于熔炉中,升温至1200℃使其熔化,保温150min,然后加入占铝合金粉重量比为0.8%的稀土粉末,继续升温至1500℃,在1000r/min的条件下搅拌20min并保温30min,将熔炉温度降至750℃后浇铸,制得铝合金铸锭,其中,所述稀土粉末为重量比为3:4:7的Y2O3、La2O3和CeO2构成的混合物;将铝合金铸锭进行400℃/12h+460℃/12h的双级均匀化处理,并对铝合金铸锭进行多次轧制处理,再在465℃的条件下固溶处理60min,然后淬火,将淬火后的铝合金铸锭置于干燥箱中在120℃的条件下时效处理24h,制得铝合金粗品;
(2)将所述铝合金粗品浸入至由21.5mmol/L的AlCl3和0.86mol/L的尿素构成的混合溶液中,在160℃的条件下反应35h,清洗后在4.5mmol/L的硬脂酸乙醇溶液中浸泡2h,清洗后烘干,制得活化铝合金;
(3)将白醇酸和稀释剂混合均匀后加入浓度为30g/L的二苯基磷酸溶液并混合均匀,制得磷化溶液,其中,白醇酸、稀释剂和二苯基磷酸溶液的质量比4:1:0.6,稀释剂由40wt%的乙酸乙酯、10wt%的正丁醇、10wt%的乙醇、10wt%的丙酮和30wt%的二甲苯构成;向所述磷化溶液中按照质量分数为1.2%的比例加入硝酸镧溶液,混合均匀,制得涂层原料;
(4)将步骤(2)制得的活化铝合金置于步骤(3)制得的涂层原料中浸渍5次,每次浸渍10min,每次浸渍完成后取出并自然阴干,然后再进行下一浸渍,待浸渍完成后在45℃的条件下固化5h,制得高强度高耐候性铝合金。
实施例3:
本实施例的高耐候性铝合金制备方法,包括:
(1)将铝合金粉置于熔炉中,升温至1100℃使其熔化,保温18min,然后加入占铝合金粉重量比为0.7%的稀土粉末,继续升温至1450℃,在900r/min的条件下搅拌25min并保温40min,将熔炉温度降至748℃后浇铸,制得铝合金铸锭,其中,所述稀土粉末为重量比为3:4:7的Y2O3、La2O3和CeO2构成的混合物;将铝合金铸锭进行400℃/12h+460℃/12h的双级均匀化处理,并对铝合金铸锭进行多次轧制处理,再在465℃的条件下固溶处理60min,然后淬火,将淬火后的铝合金铸锭置于干燥箱中在120℃的条件下时效处理24h,制得铝合金粗品;
(2)将所述铝合金粗品浸入至由21.5mmol/L的AlCl3和0.86mol/L的尿素构成的混合溶液中,在158℃的条件下反应3.2h,清洗后在4.5mmol/L的硬脂酸乙醇溶液中浸泡1.8h,清洗后烘干,制得活化铝合金;
(3)将白醇酸和稀释剂混合均匀后加入浓度为30g/L的二苯基磷酸溶液并混合均匀,制得磷化溶液,其中,白醇酸、稀释剂和二苯基磷酸溶液的质量比4:1:0.6,稀释剂由40wt%的乙酸乙酯、10wt%的正丁醇、10wt%的乙醇、10wt%的丙酮和30wt%的二甲苯构成;向所述磷化溶液中按照质量分数为1.2%的比例加入硝酸镧溶液,混合均匀,制得涂层原料;
(4)将步骤(2)制得的活化铝合金置于步骤(3)制得的涂层原料中浸渍4次,每次浸渍12min,每次浸渍完成后取出并自然阴干,然后再进行下一浸渍,待浸渍完成后在45℃的条件下固化4.5h,制得高强度高耐候性铝合金。
试验例
将上述实施例1-3制得的铝合金样品进行性能检测。对比例为市面出售的Al-Zn-Mg-Cu系铝合金。测试结果见表1。
表1
从表1可以看出,本发明实施例的抗拉伸强度明显高于对比例,并且其在25℃和-20℃下的抗腐蚀性能也优于对比例。
以上所述仅为本发明的较佳实施例,并不用以限制本发明,凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (4)
1.一种高耐候性铝合金的制备方法,其特征在于,包括:
(1)将铝合金粉置于熔炉中,升温至1000-1200℃使其熔化,保温15-20min,然后加入占铝合金粉重量比为0.65-0.8%的稀土粉末,继续升温至1400-1500℃,在800-1000r/min的条件下搅拌20-30min并保温30-45min,将熔炉温度降至745-750℃后浇铸,制得铝合金铸锭,其中,所述稀土粉末为重量比为3:4:7的Y2O3、La2O3和CeO2构成的混合物;将铝合金铸锭进行400℃/12h+460℃/12h的双级均匀化处理,并对铝合金铸锭进行多次轧制处理,再在465℃的条件下固溶处理60min,然后淬火,将淬火后的铝合金铸锭置于干燥箱中在120℃的条件下时效处理24h,制得铝合金粗品;
(2)将所述铝合金粗品浸入至由21.5mmol/L的AlCl3和0.86mol/L的尿素构成的混合溶液中,在155-160℃的条件下反应3-3.5h,清洗后在4.5mmol/L的硬脂酸乙醇溶液中浸泡1.5-2h,清洗后烘干,制得活化铝合金;
(3)将白醇酸和稀释剂混合均匀后加入浓度为30g/L的二苯基磷酸溶液并混合均匀,制得磷化溶液,其中,白醇酸、稀释剂和二苯基磷酸溶液的质量比4:1:0.6,稀释剂由40wt%的乙酸乙酯、10wt%的正丁醇、10wt%的乙醇、10wt%的丙酮和30wt%的二甲苯构成;向所述磷化溶液中按照质量分数为1.2%的比例加入硝酸镧溶液,混合均匀,制得涂层原料;
(4)将步骤(2)制得的活化铝合金置于步骤(3)制得的涂层原料中浸渍3-5次,每次浸渍10-15min,每次浸渍完成后取出并自然阴干,然后再进行下一浸渍,待浸渍完成后在45℃的条件下固化4-5h,制得高强度高耐候性铝合金。
2.根据权利要求1所述的高耐候性铝合金的制备方法,其特征在于,所述铝合金粉为Al-Zn-Mg-Cu系铝合金。
3.根据权利要求2所述的高耐候性铝合金的制备方法,其特征在于,所述Al-Zn-Mg-Cu系铝合金包括按重量百分比计的以下组分:
Zn 10.82%,Mg 3.03%,Cu 1.45%,Cr 0.12%,Zr 0.26%,Mn 0.24%,余量为Al。
4.权利要求1至3任一项所述的制备方法制备得到的高耐候性铝合金。
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