1 范围

This standard specifies test methods for silver and silver alloy electrocoatings for engineering, decoration and protection against contamination by residual salts.

本标准适用于金属零件; 不适用于复合材料零件, 例如塑料和涂层金属零件.

2 原则

The part is boiled in water with known conductivity for a specified period of time and the increase in conductivity resulting from the precipitation of residual salts and other conductive impurities is measured.

国际标准化组织 4522-3-1988 – 银及银合金金属镀层的试验方法 – 部分 3: 残留盐的测定

3 试剂

水: 电导率不大于100μs/m 20 ±1℃.

4 仪器

所有使用的玻璃仪器均应由硼硅酸盐玻璃制成, 应符合中规定的清洁度要求 5.2, and shall be kept separately for the purpose of this test.

4.1 圆底烧瓶: the capacity is 250mL, 并安装水回流冷凝管.

4.2 烧杯: the size shall be suitable for the part under test, 标有100mL刻度, and equipped with appropriate devices to reduce excessive evaporation loss of water, 如冷却水盖.

4.3 电导率仪

国际标准化组织 4522-3-1988 – 银及银合金金属镀层的试验方法 – 部分 3: 残留盐的测定

5 测试方法

5.1 样本

Take one or more parts fully covered by coated metal with a total surface area of approximately 30cm2 and test according to 5.3.1 或者 5.3.2 according to their dimensions (看 5.3).

确保避免样品意外污染, in the inspection to bring clean glove corner out of the parts.

5.2 仪器清洁度检查

测定前, 100毫升水 (见章节 3) was added to the test vessel (看 4.1 或者 4.2) 然后在规定的测试条件下缓慢煮沸10min (看 5.3.1 和 5.3.2). 将水冷却至 20 °C±1°C，用电导仪测量其电导率 (看 4.3).

国际标准化组织 4522-3-1988 – 银及银合金金属镀层的试验方法 – 部分 3: 残留盐的测定

如果测量值超过 100μS/m, it was redetermined with another 100mL of water. If the measured value exceeded 100µS/m again, the test was performed with a new container.

Qualified glass instruments shall be kept separately for this test.

5.3 Determination

5.3.1 Samples with a cross section width or diameter less than 15mm and a length less than 40mm.

检查仪器清洁度后 (看 5.2), 放置样品 (看 5.1) into a round-bottomed flask and add 100mL of water (见章节 3). The conductivity of the water should have been determined quickly before the measurement. 将试件完全浸入水中. Install a reflux condensing tube on the flask and slowly boil for 10min. Allow the water to cool to 20 ° C ±1 ° C and measure its conductivity with a conductivity meter (看 4.3). 将测量结果计算出电导率的附加值.

5.3.2 横截面宽度或直径大于15mm且长度大于40mm的样品.

Conduct the test as described in 5.3.1. 放置样品 (看 5.1) 放入烧杯中 (看 4.2) 已加水至100mL刻度. 防止测量过程中水分过度蒸发而损失, 可以使用冷却水盖，并且, 如果需要的话, 额外的水 (见章节 3) 可以添加以代替蒸发的水.

国际标准化组织 4522-3-1988 – 银及银合金金属镀层的试验方法 – 部分 3: 残留盐的测定

6 测试报告

检测报告至少应包括以下内容:

A) 引用本标准;

乙) 试样名称或编号;

) 测试样品的总表面积,平方厘米; d) 所用仪器的名称或型号;

) 测试中观察到的异常情况; F) 与此方法不同的任何说明;

G) 测试结果及呈现方法;

H) 测试日期;

我) 操作者和测试实验室名称.