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Solder lead contamination, effects

The composition and pH of water also affect the oxidation of lead metal. Modern drinking water treatment is highly effective at removing lead from water before it is pumped to the consumer most water contamination comes from corrosion in distribution systems, that is, lead pipes and lead-based solder (408). Under acidic or neutral conditions in the presence of oxygen, metallic lead is readily oxidized to Pb ", as can be seen from the equations below and from Figure 21 (48, 408, 409). [Pg.85]

Vianco et al. [74] examined the effect of Pb contamination on the performance of this lead-free solder by addition of 63Sn-37Pb alloys at levels of 0.5-8.0 wt. %. The onset melting temperatures decreased with an increasing Sn-Pb alloy content. A secondary low-temperature peak appeared at 183°C (Fig. 2) in DSC measurements, which is believed to represent a local low-melting-phase transition of the Sn Pb system. The contact angle depends upon the amount of Sn-Pb alloy addition, as shown in Fig. 28 (also see Sec. HI. A-2). [Pg.800]

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See also in sourсe #XX -- [ Pg.549 ]



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