ISO 8502-2:2005 使用涂漆及相关产品之前钢基底材料的加工 表面光洁度评估试验 第2部分：倾斜表面上氯化物的实验室测定

标准编号：ISO 8502-2:2005

中文名称：使用涂漆及相关产品之前钢基底材料的加工 表面光洁度评估试验 第2部分：倾斜表面上氯化物的实验室测定

英文名称：Preparation of steel substrates before application of paints and related products — Tests for the assessment of surface cleanliness — Part 2: Laboratory determination of chloride on cleaned surfaces

发布日期：2005-10

标准范围

ISO 8502-2:2005描述了一种测定易溶于水且存在于钢表面的含氯化物盐的方法。该方法也适用于之前涂覆的表面。通常在实验室使用从现场表面取样的洗涤液。ISO 8502-2:2005适用于测定在清洁操作之前、期间或之后沉积在钢表面上的盐。ISO 8502-2:2005不适用于经铬酸盐、亚硝酸盐或胺处理的表面，这些表面通常在湿式喷砂清理时用作水中的抑制剂。这是因为洗涤水中铬酸盐浓度大于等于10 mg/l或亚硝酸盐浓度大于等于20 mg/l会干扰氯化物的测定。此外，胺抑制剂可在基质上形成氢氧化物边界层（不溶于水），并防止水接触底层盐进行去除。10 mg/l的铁（III）离子浓度也会干扰测定，但铁（III）离子会集中在铁锈沉积物中，铁锈沉积物会通过过滤从试验溶液中去除。

ISO 8502-2:2005 describes a method for the determination of chloride-containing salts that are readily soluble in water and are present on a steel surface. The method is also applicable to previously coated surfaces. It will normally be used in a laboratory using washings sampled from surfaces on site.ISO 8502-2:2005 is applicable to the determination of salts that have been deposited on the steel surface before, during or after the cleaning operations.ISO 8502-2:2005 is not applicable to surfaces treated with chromate, nitrite or amine, which are commonly used as inhibitors in the water when wet blast-cleaning. This is because a chromate concentration of 10 mg/l or greater or a nitrite concentration of 20 mg/l or greater in the wash water interferes with the determination of the chloride. Also the amine inhibitors can form a hydroxide boundary layer (not water soluble) over the substrate and prevent the water from contacting the underlying salt for its removal. An iron(III) ion concentration of 10 mg/l also interferes with the determination, but the iron(III) ions are concentrated in the rust deposits, which are removed from the test solution by filtration.

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