ISO 4524-2:2000 金属覆盖层 金和金合金电镀层的试验方法 第2部分：混合流动气体（MFG）环境试验

标准编号：ISO 4524-2:2000

中文名称：金属覆盖层 金和金合金电镀层的试验方法 第2部分：混合流动气体（MFG）环境试验

英文名称：Metallic coatings — Test methods for electrodeposited gold and gold alloy coatings — Part 2: Mixed flowing gas (MFG) environmental tests

发布日期：2000-03

标准范围

ISO 4524的本部分规定了进行混合流动气体（MFG）环境试验的程序，包括:暴露在受控数量的腐蚀性气体混合物中。它描述了所需的设备和气体、温度和湿度控制方法，使测试能够以可复制的方式进行。通过使用对照试样测量再现性腐蚀膜通过质量增益、库仑法或各种电子和X射线束分析进行评估技术。再现性也可以通过使用电阻或电阻的现场腐蚀速率监测器来测量质量频率变化法。制造试验可用于:_评估新型电接触金属化对环境暴露导致的降解的敏感性测试腐蚀性气体；_评估连接器外壳的屏蔽能力，该外壳可作为腐蚀性气体进入的屏障气体；_评估其他连接器材料（如塑料外壳）对试验降解的敏感性腐蚀性气体。制造商试验通常不包括:_用作孔隙率测试（有关孔隙率测试的指南，请参阅ISO 10308，金属涂层-孔隙率审查测试）；_适用于失效机制不是污染气体腐蚀的情况，例如镀锡可分离材料联络。

This part of ISO 4524 provides procedures for conducting mixed flowing gas (MFG) environmental tests involvingexposures to controlled quantities of corrosive gas mixtures.It describes the required equipment and the methods for gas, temperature and humidity control that enable tests tobe conducted in a reproducible manner. Reproducibility is measured through the use of control coupons thecorrosion films of which are evaluated by mass gain, coulometry or by various electron and X-ray beam analysistechniques. Reproducibility can also be measured by in situ corrosion rate monitors using electrical resistance ormass frequency change methods.MFG tests can be used to:_ evaluate novel electrical contact metallization for susceptibility to degradation due to environmental exposureto the test corrosive gases;_ evaluate the shielding capability of connector housings that may act as a barrier to the ingress of corrosivegases;_ evaluate the susceptibility of other connector materials such as plastic housings to degradation from the testcorrosive gases.MFG tests are not normally:_ used as porosity tests (for guidance on porosity testing, see ISO 10308, Metallic coatings — review of porositytests);_ applicable where the failure mechanism is other than pollutant gas corrosion such as in tin-coated separablecontacts.

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