CN104294245A - 一种镁合金表面防腐的方法 - Google Patents

一种镁合金表面防腐的方法 Download PDF

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CN104294245A
CN104294245A CN201410579499.6A CN201410579499A CN104294245A CN 104294245 A CN104294245 A CN 104294245A CN 201410579499 A CN201410579499 A CN 201410579499A CN 104294245 A CN104294245 A CN 104294245A
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phosphoric acid
alloy surface
ammonium phosphate
magnesium alloy
solution
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黄忠波
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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
    • C23C22/05—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
    • C23C22/07—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 containing phosphates
    • 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

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  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Abstract

本发明涉及一种镁合金表面防腐的方法，配制浓度为32-35％的磷酸和磷酸盐溶液，将待处理的镁及镁合金放置于该溶液中36-60小时；用低压蒸汽加热待处理金属表面，加热温度为130-150℃，加热时间为10-20小时。

Description

一种镁合金表面防腐的方法
技术领域
本发明属于金属表面除锈技术领域，特别是指一种镁合金表面防腐的方法。
背景技术
镁及镁合金为活泼金属，在自然环境中很容易腐蚀，镁及镁合金的腐蚀问题，目前主要有三种解决方式，第一种是涂覆防腐涂料，第二种是采用电镀耐腐蚀金属，第三种采用合金方式来解决，但对于大多数镁合金也需要进行防腐蚀处理。对于第一种和第二种处理方式，在进行防腐处理前要进行除锈处理，即用除锈剂去除金属表面的锈蚀或氧化层，再涂覆防腐蚀材料或电镀，这种方式增加了成本和操作工艺。
发明内容
本发明的目的在于克服现有技术的不足，提供一种防腐蚀方法，该方法能够根据各领域中的镁及镁合金的腐蚀特点，在有效实现了抗腐蚀效果的同时减少了生产成本和环境污染。
本发明是通过以下技术方案实现的：
一种镁合金表面防腐的方法，其包括以下步骤：
1)配制浓度为32-35％的磷酸和磷酸盐溶液，将待处理的镁及镁合金放置于该溶液中36-60小时；所述磷酸和磷酸盐的摩尔比为1∶2；
2)用低压蒸汽加热待处理金属表面，加热温度为130-150℃，加热时间为10-20小时。
所述的磷酸盐为磷酸氢二铵，磷酸二氢铵或磷酸铵中的一种；优选为磷酸氢二铵。
本发明的有益效果是：
通过本发明的技术方案，不需要去除金属表面的氧化层或锈层，因此不会造成金属厚度的损失，并且将镁及镁合金表面的锈及氧化层直接转变为耐腐蚀防护层。
具体实施方式
以下通过具体实施例来详细描述本发明的技术方案。
一种镁合金表面防腐的方法，其包括以下步骤：
1)配制浓度为32-35％的磷酸和磷酸盐溶液，将待处理的镁及镁合金放置于该溶液中36-60小时；所述磷酸和磷酸盐的摩尔比为1∶2；
2)用低压蒸汽加热待处理金属表面，加热温度为130-150℃，加热时间为10-20小时。
所述的磷酸盐为磷酸氢二铵，磷酸二氢铵或磷酸铵中的一种；优选为磷酸氢二铵。
在本技术方案中主要是利用分子的渗透性能，磷酸盐分子通过渗透进入到镁及镁合金内部，再经过蒸汽加热，磷酸盐和镁反应生成磷酸盐镁及氢氧化镁，而这两种产物均为难溶于水，并且因形成于镁及镁合金表面的内部，能够直接封闭表面的空隙，起到保护作用。
例用本技术方案对二块镁合金板进行处理，其中一块为有氧化层镁合金板，一块为表面经去除氧化层处理的镁合金板，将这二块镁合金板的一面均经相同条件用上述方式进行处理，并均于25-35℃的温度范围内140小时后，放置于25℃，8％盐溶液中60天后观察，经本技术方案处理一面的金属板没有变化，而没有经本技术方案处理的一面腐蚀现象相当明显。

Claims (3)

1.一种镁合金表面防腐的方法，其特征在于：包括以下步骤：
1)配制浓度为32-35％的磷酸和磷酸盐溶液，将待处理的镁及镁合金放置于该溶液中36-60小时；所述磷酸与磷酸盐的摩尔比为1∶2；
2)用低压蒸汽加热待处理金属表面，加热温度为130-150℃，加热时间为10-20小时。
2.根据权利要求1所述的镁合金表面防腐的方法，其特征在于：所述的磷酸盐为磷酸氢二铵，磷酸二氢铵或磷酸铵中的一种。
3.根据权利要求2所述的镁合金表面防腐的方法，其特征在于：所述的磷酸盐优选为磷酸氢二铵。
CN201410579499.6A 2014-10-24 2014-10-24 一种镁合金表面防腐的方法 Pending CN104294245A (zh)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105296981A (zh) * 2015-11-10 2016-02-03 黄忠波 一种镁及镁合金防腐的方法
CN106282991A (zh) * 2016-08-19 2017-01-04 张超 一种镁及镁合金防腐的方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105296981A (zh) * 2015-11-10 2016-02-03 黄忠波 一种镁及镁合金防腐的方法
CN106282991A (zh) * 2016-08-19 2017-01-04 张超 一种镁及镁合金防腐的方法

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