1.1 本试验方法涵盖了腐蚀电位的测量程序（参见 注1 )在氯化钠水溶液中加入足够的过氧化氢以提供充足的阴极反应物。 注1: 腐蚀电位有时被称为开路电位或静止电位。参见术语 G193号机组 . 1.2 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.3 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。 1.4 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====== 3.1 铝合金的腐蚀电位取决于固溶体中合金元素的含量。铜和锌是铝的两种主要合金元素，它们的作用最大，铜的电势向高贵或正方向移动，锌的电势向积极或负方向移动。例如，当根据该方法测量时，商用非合金铝（1100合金）的电势为-750 mV，2024-T3合金的几乎所有标称4.3%的铜都在固溶体中，电势为-600 mV至–620mV，取决于淬火速度和7072合金，其几乎所有标称1.0%的锌在固溶体中，电位为–885 mV（SCE） ( 1- 3. ) . 3. 3.2 由于腐蚀电位反映了固溶体中某些合金元素的数量，因此它是表征铝合金冶金条件的有用工具，尤其是2XXX和7XXX类型的铝合金，其中铜和锌是主要合金元素。 其用途包括测定固溶热处理和退火的有效性 ( 1. ) ，人工老化过程中的沉淀程度 ( 4. ) 和焊接 ( 5. ) 以及合金元素从包芯扩散到包铝产品包层的程度 ( 2. ) .

1.1 This test method covers a procedure for measurement of the corrosion potential (see Note 1 ) of an aluminum alloy in an aqueous solution of sodium chloride with enough hydrogen peroxide added to provide an ample supply of cathodic reactant. Note 1: The corrosion potential is sometimes referred to as the open-circuit solution or rest potential. See Terminology G193 . 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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. 1.4 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 ====== 3.1 The corrosion potential of an aluminum alloy depends upon the amounts of certain alloying elements that the alloy contains in solid solution. Copper and zinc, which are two of the major alloying elements for aluminum, have the greatest effect with copper shifting the potential in the noble or positive direction, and zinc in the active or negative direction. For example, commercially unalloyed aluminum (1100 alloy) has a potential of –750 mV when measured in accordance with this method, 2024–T3 alloy with nearly all of its nominal 4.3 % copper in solid solution, a potential of –600 mV to –620 mV, depending upon the rate of quenching and 7072 alloy with nearly all of its nominal 1.0 % zinc in solid solution, a potential of –885 mV (SCE) ( 1- 3 ) . 3 3.2 Because it reflects the amount of certain alloying elements in solid solution, the corrosion potential is a useful tool for characterizing the metallurgical condition of aluminum alloys, especially those of the 2XXX and 7XXX types, which contain copper and zinc as major alloying elements. Its uses include the determination of the effectiveness of solution heat treatment and annealing ( 1 ) , of the extent of precipitation during artificial aging ( 4 ) and welding ( 5 ) , and of the extent of diffusion of alloying elements from the core into the cladding of Alclad products ( 2 ) .