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

被代替

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

适用范围

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; 标准电极电位表与电偶序的详述 有的金属在电偶序中可能占有两个位置，分别由金属的活化态和钝化态所决定的。电偶序是一种非平衡的稳定电极电位表，它随介质而变。根据电偶序可预示金属或者合金在该种介质中的活泼性和腐蚀反应的倾向，可以预测异种金属在该介质中接触的时候发生电偶腐蚀的可能性、电偶电池中金属的极性和反应方向。... 电化学工作站的应用有哪些 3 电镀研究 　　利用电化学工作站进行电偶电流测试是研究金属沉积速度的一种非常方便的研究方法，使用电化学工作站测试出浸镀过程电偶电流曲线，电偶电流曲线上的电偶电流的大小实际上反映的是瞬间的沉积速度，由于浸镀过程的置换反应是在镀体表面进行的，该表面一旦被溶液中析出的镀层所覆盖，后续的置换反应随即受到抑制。... 不看不知道,电化学工作站能对多个领域进行研究 3.电镀研究 　　利用电化学工作站进行电偶电流测试是研究金属沉积速度的一种非常方便的研究方法，使用电化学工作站测试出浸镀过程电偶电流曲线，电偶电流曲线上的电偶电流的大小实际上反映的是瞬间的沉积速度，由于浸镀过程的置换反应是在镀体表面进行的，该表面一旦被溶液中析出的镀层所覆盖，后续的置换反应随即受到抑制。... 电化学工作站对多个领域进行研究 3.电镀研究 　　利用电化学工作站进行电偶电流测试是研究金属沉积速度的一种非常方便的研究方法，使用电化学工作站测试出浸镀过程电偶电流曲线，电偶电流曲线上的电偶电流的大小实际上反映的是瞬间的沉积速度，由于浸镀过程的置换反应是在镀体表面进行的，该表面一旦被溶液中析出的镀层所覆盖，后续的置换反应随即受到抑制。... Copyright ©2007-2022 ANTPEDIA, All Rights Reserved 京ICP备07018254号 京公网安备1101085018 电信与信息服务业务经营许可证：京ICP证110310号