ASTM G82-98(2014)
預測電偶腐蝕性能用電偶系列的制定和使用標準指南

Standard Guide for Development and Use of a Galvanic Series for Predicting Galvanic Corrosion Performance

被代替

標準號

ASTM G82-98(2014)

發布

1998年

發布單位

美國材料與試驗協會

替代標準

ASTM G82-98(2021)e1

當前最新

ASTM G82-98(2021)e1

 

 

引用標準

ASTM G15 ASTM G16 ASTM G3 ASTM G71

適用范圍

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; 標準電極電位表與電偶序的詳述 有的金屬在電偶序中可能占有兩個位置，分別由金屬的活化態和鈍化態所決定的。電偶序是一種非平衡的穩定電極電位表，它隨介質而變。根據電偶序可預示金屬或者合金在該種介質中的活潑性和腐蝕反應的傾向，可以預測異種金屬在該介質中接觸的時候發生電偶腐蝕的可能性、電偶電池中金屬的極性和反應方向。... 電化學工作站的應用有哪些 3 電鍍研究?　　利用電化學工作站進行電偶電流測試是研究金屬沉積速度的一種非常方便的研究方法，使用電化學工作站測試出浸鍍過程電偶電流曲線，電偶電流曲線上的電偶電流的大小實際上反映的是瞬間的沉積速度，由于浸鍍過程的置換反應是在鍍體表面進行的，該表面一旦被溶液中析出的鍍層所覆蓋，后續的置換反應隨即受到抑制。... 不看不知道,電化學工作站能對多個領域進行研究 3.電鍍研究?　　利用電化學工作站進行電偶電流測試是研究金屬沉積速度的一種非常方便的研究方法，使用電化學工作站測試出浸鍍過程電偶電流曲線，電偶電流曲線上的電偶電流的大小實際上反映的是瞬間的沉積速度，由于浸鍍過程的置換反應是在鍍體表面進行的，該表面一旦被溶液中析出的鍍層所覆蓋，后續的置換反應隨即受到抑制。... 電化學工作站對多個領域進行研究 3.電鍍研究?　　利用電化學工作站進行電偶電流測試是研究金屬沉積速度的一種非常方便的研究方法，使用電化學工作站測試出浸鍍過程電偶電流曲線，電偶電流曲線上的電偶電流的大小實際上反映的是瞬間的沉積速度，由于浸鍍過程的置換反應是在鍍體表面進行的，該表面一旦被溶液中析出的鍍層所覆蓋，后續的置換反應隨即受到抑制。... Copyright ?2007-2022 ANTPEDIA, All Rights Reserved 京ICP備07018254號 京公網安備1101085018 電信與信息服務業務經營許可證：京ICP證110310號

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