BS EN 62321-7-1:2015描述了沸水提取程序，旨在提供 无色和无色溶液中六价铬（Cr（VI））的定性测定 金属样品上的彩色防腐涂层。由于Cr（VI）的高度反应性，腐蚀防护涂层中Cr（VI）的浓度 随着时间和存储条件的变化会发生剧烈变化。因为之前的储存条件 样品提交通常不为人所知，也不随样品一起提供，这是一个程序 根据检测时涂层中检测到的Cr（VI）含量，确定Cr（VI）的存在 测试。对于新涂层样品的测试，最短等待时间为5天（试验结束后） 涂层工艺）是确保涂层稳定所必需的。这段等待期 允许在测试之前，将铬（III）氧化为铬（VI）。 Cr（VI）的存在取决于涂层每表面积的Cr（VI）质量， 单位为µg/cm²。这种方法是首选的，因为防腐涂层的重量通常是 生产后难以准确测量。从涂层技术的角度来看 整个行业已经过渡到使用非铬（VI）为基础的化学物质——如果 几乎不应存在六价铬，或者使用传统的六价铬化学试剂- 存在显著水平的Cr（VI）并且能够可靠地检测到。考虑到这个行业 此外，Cr（VI）的存在或不存在通常足以满足合规性测试目的。 在本程序中，当检测到样品中的Cr（VI）低于0.10µg/cm²的LOQ（限值 定量），则认为样品的Cr（VI）为阴性。因为Cr（VI）可能不是 均匀分布在涂层中，即使在同一批样品中，涂层之间也有一个“灰色区” 0,10µg/cm²和0,13µg/cm²被确定为“非决定性”，以减少由于不可避免的涂层变化而导致的不一致结果。在这种情况下，可能需要进行额外的测试 确认有必要的Cr（VI）。当检测到高于0.13µg/cm²的Cr（VI）时 样品被认为是涂层中Cr（VI）的阳性。交叉引用:IEC 62321-1EN 62321-1IEC 62321-2EN 62321-2ISO 78-2ISO 3696EN ISO 3696ISO 3613EN ISO 3613ISO 648EN ISO 648DIN EN 15205:2007EN 15205:2006111/320/INFASTM E1272-02取代了BS EN 62321:2009，该标准仍然有效。购买本文件时，包括所有当前可用的修订版。

BS EN 62321-7-1:2015 describes a boiling water extraction procedure intended to provide a qualitative determination of the presence of hexavalent chromium (Cr(VI)) in colourless and coloured corrosion-protection coatings on metallic samples.Due to its highly reactive nature, the concentration of Cr(VI) in a corrosion-protection coating can change drastically with time and storage conditions. Since storage conditions prior to sample submission are not often known or provided with the samples, this procedure determines the presence of Cr(VI) based on the levels detected in the coatings at the time of testing. For testing of freshly coated samples, a minimum waiting period of 5 days (after the coating process) is necessary to ensure the coatings have stabilized. This waiting period allows potential post-process oxidation of Cr(III) to Cr(VI) to occur prior to testing.The presence of Cr(VI) is determined by the mass of Cr(VI) per surface area of the coating, in µg/cm². This approach is preferred since corrosion-protection coating weights are often difficult to measure accurately after production. From a coating technology perspective, the industry as a whole has transitioned to either using the non-Cr(VI) based chemistries - where little to no Cr(VI) should be present - or using the traditional Cr(VI) based chemistries - where significant levels of Cr(VI) are present and can be detected reliably. Given this industry shift, the presence or absence of Cr(VI) is often sufficient for compliance testing purposes. In this procedure, when Cr(VI) in a sample is detected below the 0,10 µg/cm² LOQ (limit of quantification), the sample is considered to be negative for Cr(VI). Since Cr(VI) may not be uniformly distributed in the coating even within the same sample batch, a "grey zone" between 0,10 µg/cm² and 0,13 µg/cm² has been established as "inconclusive" to reduce inconsistent results due to unavoidable coating variations. In this case, additional testing may be necessary to confirm the presence of Cr(VI). When Cr(VI) is detected above 0,13 µg/cm², the sample is considered to be positive for the presence of Cr(VI) in the coating layer.Cross References:IEC 62321-1EN 62321-1IEC 62321-2EN 62321-2ISO 78-2ISO 3696EN ISO 3696ISO 3613EN ISO 3613ISO 648EN ISO 648DIN EN 15205:2007EN 15205:2006111/320/INFASTM E1272-02Replaces BS EN 62321:2009 which remains currentAll current amendments available at time of purchase are included with the purchase of this document.