ASTM G82-98(2014)
预测电偶腐蚀性能用电偶系列的制定和使用标准指南
Standard Guide for Development and Use of a Galvanic Series for Predicting Galvanic Corrosion Performance
ASTM G82-98(2014) 发布历史
ASTM G82-98(2014)由美国材料与试验协会 US-ASTM 发布于 1998。
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ASTM G82-98(2014) 发布之时，引用了标准
- ASTM G15 有关腐蚀及腐蚀试验的标准术语*， 1999-07-06 更新
- ASTM G16 用统计作腐蚀数据分析的标准指南
- ASTM G3 腐蚀检验中使用的电化测量的常规方法标准实施规程
- ASTM G71 电解质中电偶腐蚀试验的进行和评定的标准指南*， 2019-05-01 更新
* 在 ASTM G82-98(2014) 发布之后有更新，请注意新发布标准的变化。
ASTM G82-98(2014)的历代版本如下：
- 2021年 ASTM G82-98(2021)e1 预测电偶腐蚀性能用电偶系列的制定和使用标准指南
- 1998年 ASTM G82-98(2014) 预测电偶腐蚀性能用电偶系列的制定和使用标准指南
- 1998年 ASTM G82-98(2009) 预测电流腐蚀特性用电流系列的制定和使用的标准指南
- 1998年 ASTM G82-98(2003) 预测电流腐蚀特性用电流系列的制定和使用标准指南
- 1998年 ASTM G82-98 预测电流腐蚀特性用电流系列的制定和使用标准指南
4.1 When two dissimilar metals in electrical contact are exposed to a common electrolyte, one of the metals can undergo increased corrosion while the other can show decreased corrosion. This type of accelerated corrosion is referred to as galvanic corrosion. Because galvanic corrosion can occur at a high rate, it is important that a means be available to alert the user of products or equipment that involve the use of dissimilar metal combinations in an electrolyte of the possible effects of galvanic corrosion.
4.2 One method that is used to predict the effects of galvanic corrosion is to develop a galvanic series by arranging a list of the materials of interest in order of observed corrosion potentials in the environment and conditions of interest. The metal that will suffer increased corrosion in a galvanic couple in that environment can then be predicted from the relative position of the two metals in the series.
4.3 Types of Galvanic Series:
4.3.1 One type of Galvanic Series lists the metals of interest in order of their corrosion potentials, starting with the most active (electronegative) and proceeding in order to the most noble (electropositive). The potentials themselves (versus an appropriate reference half-cell) are listed so that the potential difference between metals in the series can be determined. This type of Galvanic Series has been put in graphical form as a series of bars displaying the range of potentials exhibited by the metal listed opposite each bar. Such a series is illustrated in Fig. 1.
Note 1—Dark boxes indicate active behavior of active-passive alloys. FIG. 1 Galvanic Series of Various Metals in Flowing Seawater at 2.4 to 4.0 m/s for 5 to 15 Days at 5 to 30°C (Redrawn from Original) (see Footnote 5)4.3.2 The second type of galvanic series is similar to the first in that it lists the metals of interest in order of their corrosion potentials. The actual potentials themselves are not specified, however. Thus, only the relative position of materials in the series is known and not the magnitude of their potential difference. Such a series is shown in Fig. 2.
ACTIVE END
Magnesium
8199;8199;8199;(−)
Magnesium Alloys
8199;8199;8199;8201;↑
Zinc
8199;8199;8199;8201;
- 标准号
- ASTM G82-98(2014)
- 发布
- 1998年
- 发布单位
- 美国材料与试验协会
- 替代标准
- ASTM G82-98(2021)e1
- 当前最新
- ASTM G82-98(2021)e1
- 引用标准
- ASTM G15 ASTM G16 ASTM G3 ASTM G71