Influence of natural organic matter on the corrosion of leaded brass in potable water
In: Corrosion science. Pergamon: Oxford, etc.. ISSN 0010-938X; e-ISSN 1879-0496, more
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| Authors | | Top |
- Korshin, G.V.
- Ferguson, J.F.
- Lancaster, A.N.
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| Abstract |
Natural organic matter (NOM) affects the rate of metal leaching from the surface of leaded brass and the morphology of lead-containing corrosion products. SEM data indicate that lead forms a separate phase on the surface of the alloy. In organic-free water, hexagonal thin plates of hydrocerussite Pb3(OH)2(CO3)2 accumulate on and near corroding lead islets. NOM inhibits the growth of the crystals of hydrocerussite and promotes the formation of an amorphous hydrated surface film. The galvanic coupling of the surface lead phase with the rest of the alloy accelerates its oxidation. The share of lead in the oxidized metal leached from or accumulated on the surface, substantially exceeds that in the bulk alloy both in organic free-water and in the presence of NOM. NOM increases both short- and long-term lead leaching. Its effects are most noticeable in the range of dissolved carbon concentrations 0–2 mg/l. |
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