CN105951092A - 一种镁合金表面化学转化处理工艺 - Google Patents

一种镁合金表面化学转化处理工艺 Download PDF

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CN105951092A
CN105951092A CN201610475269.4A CN201610475269A CN105951092A CN 105951092 A CN105951092 A CN 105951092A CN 201610475269 A CN201610475269 A CN 201610475269A CN 105951092 A CN105951092 A CN 105951092A
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magnesium alloy
workpiece
dried
conversion liquid
washed
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熊雯瑛
李轶
肖宏超
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Hunan Aerospace New Material Technology Inst Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
    • C23C22/57—Treatment of magnesium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/68—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous solutions with pH between 6 and 8

Abstract

本发明提供一种镁合金表面化学转化处理工艺，包括以下工艺步骤：1）将预处理后的镁合金工件放入一次转化液中进行浸泡0.5~20分钟，所述一次转化液中含5~10wt%的HCl；浸泡完成后水洗，干燥；2）再将镁合金工件放入二次转化液中进行浸泡1~2小时，所述二次转化液中含5~10wt%的KAl(SO4)2和5~10wt%的CH3COOH；浸泡完成后再水洗，干燥。本发明采用新颖的转化液，具有成本低、设备简单、操作简便、不受工件形状限制、不影响工件表面精加工精度、无需封孔后处理的特点，经处理后得到的化学膜附着力好、耐腐蚀能力强，耐磨、致密、绝缘，且该工艺过程中不含磷、铬等有害元素。

Description

一种镁合金表面化学转化处理工艺
技术领域
本发明涉及一种镁合金表面化学转化处理工艺，属于镁合金表面的处理技术领域。
背景技术
镁合金具有比强度、比刚度高，导热、导电性能好，并具有很好的电磁屏蔽、阻尼减振性、切削加工性以及加工成本低等优点，因而在航空航天领域、国防军工领域、交通运输领域以及3C领域有广阔的应用前景。然而由于镁的化学活性较高，因此镁合金在空气中很容易氧化，且极易在各种环境条件下发生腐蚀，从而阻碍了镁合金的广泛应用。
对镁合金表面进行化学改性，是提高镁合金耐蚀性能的有效途径之一。但传统的对镁合金表面进行化学改性的方法，存在配方复杂、过程难以控制、操作困难、对环境和人体危害较大等缺点。因而，开发一种高效简便且环境友好型镁合金表面化学处理工艺，是镁合金表面处理行业的当务之急。
发明内容
本发明的目的在于针对上述现有技术的不足，提供一种镁合金表面化学转化处理工艺，该工艺过程简单，操作简便，效率高且环境友好。
本发明的技术方案是，提供一种镁合金表面化学转化处理工艺，包括以下工艺步骤：
1）将预处理后的镁合金工件放入一次转化液中进行浸泡0.5~20分钟，所述一次转化液中含5~10wt%的HCl；浸泡完成后水洗，干燥；
2）再将镁合金工件放入二次转化液中进行浸泡1~2小时，所述二次转化液中含5~10wt%的KAl(SO4)2和5~10wt%的CH3COOH；浸泡完成后再水洗，干燥。
进一步地，所述步骤1）中，浸泡的时间为0.5-3分钟。
进一步地，所述步骤1）中，二次转化液的温度为85~95℃。
进一步地，所述预处理包括机械抛光、脱脂、清洗、干燥步骤。
本发明进一步地提供一种采用上述的工艺处理得到的镁合金以及所述的镁合金在航空航天、生物医疗器械、3C领域的应用。
本发明提供的镁合金表面化学转化处理工艺，采用新颖的转化液，具有成本低、设备简单、操作简便、不受工件形状限制、不影响工件表面精加工精度、无需封孔后处理的特点，经处理后得到的化学膜附着力好、耐腐蚀能力强，耐磨、致密、绝缘，且该工艺过程中不含磷、铬等有害元素。采用特定的工艺，与其配合，进一步提高了其性能。所得到的镁合金在航空航天领域、国防军工领域、交通运输领域、3C领域、医疗器械领域、生物医疗领域等领域具有广泛的应用。
附图说明
图1表示本发明镁合金表面化学转化处理工艺的流程图。
图2表示本发明工艺一个实施例所得的镁合金表层结构示意图。
图3表示本发明工艺一个实施例所得的镁合金腐蚀试验后的实物照片。
具体实施方式
下面结合实施例对本发明作进一步说明。其中转化液中百分数均指质量百分数。
实施例 1 ：
将镁合金工件按如下步骤进行处理：
1）预处理：将镁合金工件表面进行机械抛光、脱脂等处理，清洗；
2）一次转化：将工件放入含5% HCl的一次转化液中进行浸泡，时间为2分钟；
3）水洗：在去离子水中进行浸泡清洗，干燥；
4）二次转化：将工件放入含5%的KAl(SO4)2，8%的CH3COOH的二次转化液中进行浸泡，温度为85℃，时间为2h；
5）水洗：将工件水洗干净，干燥。
实施例 2 ：
将镁合金工件按如下步骤进行处理：
1）预处理：将镁合金工件表面进行机械抛光、脱脂等处理，清洗；
2）一次转化：将工件放入含7.5% HCl的一次转化液中进行浸泡，时间为1.5分钟；
3）水洗：在去离子水中进行浸泡清洗，干燥；
4）二次转化：将工件放入含8%的KAl(SO4)2，10%的CH3COOH的二次转化液中进行浸泡，温度为90℃，时间为1.5h；
5）水洗：将工件水洗干净，干燥。
实施例 3 ：
将镁合金工件按如下步骤进行处理：
1）预处理：将镁合金工件表面进行机械抛光、脱脂等处理，清洗；
2）一次转化：将工件放入含10% HCl的一次转化液中进行浸泡，时间为1分钟；
3）水洗：在去离子水中进行浸泡清洗，干燥；
4）二次转化：将工件放入含10%的KAl(SO4)2，5%的CH3COOH的二次转化液中进行浸泡，温度为95℃，时间为1h；
5）水洗：将工件水洗干净，干燥。
镁合金化学转化处理过程见附图1；经化学转化处理后的镁合金工件表面示意图见附图2，其中1为基体层，2为转化膜层；经化学转化处理后的镁合金工件经96小时中性盐雾试验后样品实物图见附图3。
处理后效果：化学转化处理后膜层附着力强，厚度为10~100μm，经过96小时中性盐雾试验表面无明显腐蚀斑点。

Claims (6)

1. 一种镁合金表面化学转化处理工艺，其特征在于，包括以下工艺步骤：
1）将预处理后的镁合金工件放入一次转化液中进行浸泡0.5~20分钟，所述一次转化液中含5~10wt%的HCl；浸泡完成后水洗，干燥；
2）再将镁合金工件放入二次转化液中进行浸泡1~2小时，所述二次转化液中含5~10wt%的KAl(SO4)2和5~10wt%的CH3COOH；浸泡完成后再水洗，干燥。
2.如权利要求1所述的工艺，其特征在于，所述步骤1）中，浸泡的时间为0.5-3分钟。
3. 如权利要求1所述的工艺，其特征在于，所述步骤1）中，二次转化液的温度为85~95℃。
4. 如权利要求1所述的工艺，其特征在于，所述预处理包括机械抛光、脱脂、清洗、干燥步骤。
5. 一种镁合金，采用权利要求1-4任一项所述的工艺处理得到。
6.权利要求5所述的镁合金在航空航天、生物医疗器械、3C领域的应用。
CN201610475269.4A 2016-06-27 2016-06-27 一种镁合金表面化学转化处理工艺 Pending CN105951092A (zh)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104611689A (zh) * 2015-01-09 2015-05-13 山西中医学院 一种镁合金化学氧化液

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104611689A (zh) * 2015-01-09 2015-05-13 山西中医学院 一种镁合金化学氧化液

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
胡兰: "汽车用镁合金涂装前处理工艺研究", 《中国优秀硕士学位论文全文数据库（电子期刊）》 *

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Application publication date: 20160921