1.1 本试验方法涵盖了测量镁牺牲阳极试样在饱和硫酸钙、饱和氢氧化镁环境中运行的两个基本性能特性的实验室程序。两个基本特性是电极（氧化）电位和每单位质量试样消耗的安培小时数（Ah）。安装在地下的镁阳极通常由回填材料包围，通常由75 % 石膏（CaSO 4. ·2小时 2. O） ，20 % 膨润土，和5 % 硫酸钠（Na 2. SO公司 4. ). 硫酸钙、氢氧化镁试验电解质模拟了安装在石膏-膨润土-硫酸钠回填中阳极周围的长期环境。 1.2 本试验方法旨在用于阳极制造商或阳极用户的质量保证。然而，长期现场性能特性可能与使用本实验室试验获得的性能测量值不同。 注1: 参考术语 G193号 本试验方法中使用的术语。 1.3 以国际单位表示的数值视为标准值。SI单位后括号中给出的值仅供参考，不视为标准值。 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 有关具体预防措施，请参阅第节 8. 和段落 9.1.1 . 1.5 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====== 5.1 本试验是评估镁阳极的指南。该测试与服务性能之间的相关性程度尚未完全确定。 5.2 由于铸件的不均匀性，来自同一铸件的试样可能不相同。确保评估相同试样的方法是重新测试试样。重新测试前，应通过机械加工使试样表面光滑。应测量新直径并调整测试电流，以便重新测试电流密度为0.039 mA/cm 2. （0.25毫安/英寸。 2. ). 5.3 本试验方法测得的每单位质量消耗的电势和Ah值可能与现场应用中发现的值不一致。 每单位质量消耗的Ah的现场结果不太可能大于本试验中测量的结果。然而，实际测试比较不足以精确对比实验室和现场结果。

1.1 This test method covers a laboratory procedure that measures the two fundamental performance properties of magnesium sacrificial anode test specimens operating in a saturated calcium sulfate, saturated magnesium hydroxide environment. The two fundamental properties are electrode (oxidation) potential and ampere hours (Ah) obtained per unit mass of specimen consumed. Magnesium anodes installed underground are usually surrounded by a backfill material that typically consists of 75 % gypsum (CaSO 4 ·2H 2 O), 20 % bentonite clay, and 5 % sodium sulfate (Na 2 SO 4 ). The calcium sulfate, magnesium hydroxide test electrolyte simulates the long term environment around an anode installed in the gypsum-bentonite-sodium sulfate backfill. 1.2 This test method is intended to be used for quality assurance by anode manufacturers or anode users. However, long term field performance properties may not be identical to property measurements obtained using this laboratory test. Note 1: Refer to Terminology G193 for terms used in this test method. 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 1.4 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 precautions, See Section 8 and Paragraph 9.1.1 . 1.5 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 ====== 5.1 This test is a guide for evaluating magnesium anodes. The degree of correlation between this test and service performance has not been fully determined. 5.2 Test specimens from the same casting may not be identical because of inhomogeneities in the casting. A method of ensuring that identical test specimens are being evaluated is to retest a test specimen. The surface of the test specimen should be smoothed by machining before retesting. The new diameter should be measured and the test current adjusted so that the retest current density is 0.039 mA/cm 2 (0.25 mA/in. 2 ). 5.3 The values of potential and Ah per unit mass consumed as measured by this test method, may not agree with those found in field applications. It is unlikely that field results of Ah per unit mass consumed would ever be greater than those measured in this test. However, actual test comparisons are not sufficient to allow precise correlation of laboratory and field results.