Effect of changing water quality on galvanic coupling

被引：9

作者：

Boyd, Glen R. ^{[1
]}

Reiber, Steven H. ^{[1
]}

McFadden, Matthew S. ^{[1
]}

Korshin, Gregory V. ^{[1
]}

机构：

[1] Cadmus Grp, Seattle, WA 98101 USA

来源：

JOURNAL AMERICAN WATER WORKS ASSOCIATION | 2012年 / 104卷 / 03期

关键词：

Bronze - Alkalinity - Galvanic corrosion;

D O I：

10.5942/jawwa.2012.104.0038

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Two galvanic pipe-loop couples (lead copper and lead bronze) were exposed to controlled changes in water quality (disinfectant, pH, alkalinity, phosphate) and monitored for changes in lead and copper release. Open circuit potential (OCP) profiles were also measured along the junction of dissimilar metals to determine the extent of the zone affected by galvanic coupling. Grab sampling results showed that changes in water quality caused transient (short-lived) increases in lead and decreases in copper that corresponded to the galvanic action of lead on the other coupled metal. OCP measurements showed that the galvanic effect on corrosion potential can induce a shift of up to 600 mV. The extent of the galvanically affected zone was limited, penetrating no more than a few inches from the juncture along the surface of each pipe. Additional testing confirmed strong effects of external versus direct coupling on the OCP profiles in the galvanically affected zone.

引用

页码：45 / 46

页数：2