1.1 本试验方法包括根据规范的规定，测定汽车火花点火发动机燃料对银的腐蚀性 D4814 或其他司法管辖区的类似规范，蒸汽压不大于124 千帕（18 psi）37.8 °C（100 °F），通过两种程序之一。程序A涉及使用压力容器，而程序B涉及使用通风试管。 1.2 测试结果基于视觉评分，该评分被归类为0到4范围内的整数，如中所定义 表1 . 1.3 警告- 许多监管机构已将汞指定为一种危险物质，可导致严重的医疗问题。 汞或其蒸汽已被证明对健康有害，并对材料具有腐蚀性。处理汞和含汞产品时要小心。有关更多信息，请参阅适用的产品安全数据表（SDS）。当地或国家法律禁止销售汞或含汞产品，或两者兼有。用户必须确定其所在地销售的合法性。 1.4 以国际单位制表示的数值应视为标准。括号中的值仅供参考。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 有关特定警告声明，请参阅 6.1 和截面 7. . 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 原油中含有硫化物，其中大部分在精炼过程中被去除。然而，在石油产品中残留的硫化物中，有些会对各种金属产生腐蚀作用，这种腐蚀性与总硫含量无关。 此外，燃料在储存和分配过程中可能会受到腐蚀性硫化物的污染。腐蚀作用可能因含硫化合物的化学类型而异。 4.2 银片腐蚀试验旨在评估石油产品对银和银合金的相对腐蚀程度。 4.3 在某些情况下，汽车火花点火发动机燃油中存在的活性硫化合物会腐蚀或玷污油箱发送器单元中的银合金燃油表（以及某些2冲程循环发动机中的镀银轴承）。为了尽量减少或防止储罐发送器装置中的银合金因腐蚀或变色而失效，规范 D4814 要求燃料应通过银条腐蚀试验。

1.1 This test method covers the determination of the corrosiveness to silver by automotive spark-ignition engine fuel, as defined by Specification D4814 , or similar specifications in other jurisdictions, having a vapor pressure no greater than 124 kPa (18 psi) at 37.8 °C (100 °F), by one of two procedures. Procedure A involves the use of a pressure vessel, whereas Procedure B involves the use of a vented test tube. 1.2 The result of the test is based on a visual rating that is classified as an integer in the range from 0 to 4 as defined in Table 1 . 1.3 Warning— Mercury has been designated by many regulatory agencies as a hazardous substance that can cause serious medical issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Use caution when handling mercury and mercury-containing products. See the applicable product Safety Data Sheet (SDS) for additional information. The potential exists that selling mercury or mercury-containing products, or both, is prohibited by local or national law. Users must determine legality of sales in their location. 1.4 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific warning statements, see 6.1 and Section 7 . 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 Crude petroleum contains sulfur compounds, most of which are removed during refining. However, of the sulfur compounds remaining in the petroleum product, some can have a corroding action on various metals and this corrosivity is not related to the total sulfur content. In addition, fuels can become contaminated by corrosive sulfur compounds during storage and distribution. The corrosive effect can vary according to the chemical types of sulfur compounds present. 4.2 The silver strip corrosion test is designed to assess the relative degree of corrosivity of a petroleum product towards silver and silver alloys. 4.3 Reactive sulfur compounds present in automotive spark-ignition engine fuels under some circumstances can corrode or tarnish silver alloy fuel gauge in-tank sender units (and silver-plated bearings in some 2-stroke cycle engines). To minimize or prevent the failure of silver alloy in-tank sender units by corrosion or tarnish, Specification D4814 requires that fuels shall pass the silver strip corrosion test.