1.1 该测试方法涵盖了极化电阻测量的实验程序，可用于设备校准和实验技术验证。该测试方法可以提供可重复的腐蚀电位和动电位极化电阻测量。 1.2 以国际单位制表示的数值应视为标准。本标准中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。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 3.1 该测试方法可用于验证极化电阻测量设备的性能，包括参考电极、电化学电池、电位计、扫描发生器以及测量和记录设备。 该测试方法也有助于培训操作员进行样品制备和极化电阻测量的实验技术。 3.2 极化电阻可以与处于或接近其腐蚀电位的金属的一般腐蚀速率有关， E 腐蚀，腐蚀 极化电阻测量是测量一般腐蚀速率的准确而快速的方法。实时腐蚀监测是一种常见的应用。该技术也可用于按照耐一般腐蚀性的顺序对合金、抑制剂等进行分级。 3.3 在这种测试方法中，小电位扫描Δ E（吨） ，根据腐蚀电位（Δ E=E–E 腐蚀，腐蚀 )，应用于金属样品。由此产生的电流被记录下来。极化电阻， R P 腐蚀电极的 方程式1 作为电势与电流密度的斜率在 我 =0 ( 1个- 4. ) 以下为: 3. 电流密度由下式给出 我 腐蚀电流密度， 我 腐蚀，腐蚀 ，通过Stern-Geary系数与极化电阻有关， B 。 ( 3. ) ， 的尺寸 R p 为欧姆-厘米 2. ， 我 腐蚀，腐蚀 为μA/cm 2. 和 B Stern-Geary系数与阳极有关， b 一 和阴极， b c ，塔菲尔斜坡符合 方程式3 。 塔菲尔斜坡的单位是V。腐蚀速率， 铬 ，单位为毫米/年，可由 等式4 其中 电子战 是腐蚀物质的当量，单位为克，ρ是腐蚀材料的密度，单位为g/cm 3. 。 参考实践 G102 用于推导上述方程和估计塔菲尔斜率的方法。 3.4 该测试方法可能不适用于测量所有材料或所有环境中的极化电阻。看见 8.2 用于讨论由溶液电阻和电极电容引起的方法偏差。

1.1 This test method covers an experimental procedure for polarization resistance measurements which can be used for the calibration of equipment and verification of experimental technique. The test method can provide reproducible corrosion potentials and potentiodynamic polarization resistance measurements. 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 This test method can be utilized to verify the performance of polarization resistance measurement equipment including reference electrodes, electrochemical cells, potentiost- ats, scan generators, and measuring and recording devices. The test method is also useful for training operators in sample preparation and experimental techniques for polarization resistance measurements. 3.2 Polarization resistance can be related to the rate of general corrosion for metals at or near their corrosion potential, E corr . Polarization resistance measurements are an accurate and rapid way to measure the general corrosion rate. Real-time corrosion monitoring is a common application. The technique can also be used as a way to rank alloys, inhibitors, and so forth in order of resistance to general corrosion. 3.3 In this test method, a small potential scan, Δ E(t) , defined with respect to the corrosion potential (Δ E = E – E corr ), is applied to a metal sample. The resultant currents are recorded. The polarization resistance, R P , of a corroding electrode is defined from Eq 1 as the slope of a potential versus current density plot at i = 0 ( 1- 4 ) : 3 The current density is given by i . The corrosion current density, i corr , is related to the polarization resistance by the Stern-Geary coefficient, B . ( 3 ) , The dimension of R p is ohm-cm 2 , i corr is muA/cm 2 , and B is in V. The Stern-Geary coefficient is related to the anodic, b a , and cathodic, b c , Tafel slopes in accordance with Eq 3 . The units of the Tafel slopes are V. The corrosion rate, CR , in mm per year can be determined from Eq 4 in which EW is the equivalent weight of the corroding species in grams and ρ is the density of the corroding material in g/cm 3 . Refer to Practice G102 for derivations of the above equations and methods for estimating Tafel slopes. 3.4 The test method may not be appropriate to measure polarization resistance on all materials or in all environments. See 8.2 for a discussion of method biases arising from solution resistance and electrode capacitance.