Abstract
The anodic behavior of a lead-antimony alloy (3 wt% Sb) doped with alkaline-earth metals was investigated in potentiostatic method in the potentiodynamic mode at a potential sweep rate of 2 mV/s and it was shown that with an increase in the content of alkaline earth metals in the alloy (SSUZ), the potentials of free Corrosion and pitting are slightly shifted to the positive region. As the concentration of the chloride ion in the electrolyte increases, these potentials decrease. The current density of corrosion and, accordingly, the corrosion rate of alloys with an increase in the content of alkaline earth metals are reduced by 75–85%, and the concentration of chloride ion increases.In transition from alloys with calcium to alloys with strontium, the corrosion rate of alloys increases by 20–30%, and to alloys with barium it decreases by 25–30%.
Highlights
The anodic behavior of a lead-antimony alloy (3 wt% Sb) doped with alkaline-earth metals was investigated in potentiostatic method in the potentiodynamic mode at a potential sweep rate of 2 mV/s and it was shown that with an increase in the content of alkaline earth metals in the alloy (SSUZ), the potentials of free Corrosion and pitting are slightly shifted to the positive region
The current density of corrosion and, the corrosion rate of alloys with an increase in the content of alkaline earth metals are reduced by 75–85%, and the concentration of chloride ion increases
In transition from alloys with calcium to alloys with strontium, the corrosion rate of alloys increases by 20–30%, and to alloys with barium it decreases by 25–30%
Summary
Сплавы для исследования получали из свинца марки С2 (99,95%Pb), сурьмы металлической марки. Электрохимические исследования свинцовых сплавов проводили по методикам, описанным в работах [4,5,6,7,8,9,10,11,12,13,14] на потенциостате ПИ-50-1.1 в потенциостатическом режиме со скоростью развертки потенциала 2 мВ/с с помощью программаторов ПР-8 и самозаписью на ЛКД-4. Для электрохимических исследований образцы поляризовали в положительном направлении от потенциала, установившегося при погружении в исследуемый раствор – потенциал свободной коррозии или стационарный), до значения потенциала, при котором происходит резкое возрастание плотности тока до –2 А/м2 Затем образцы поляризовали в обратном направлении до значения потенциала –0,590 В, в результате чего происходило подщелачивание приэлектродного слоя поверхности образца 1. Полная поляризационная (2 мВ/с) кривая сплава тельном направлении – стационарный потенциал или потенциал свободной коррозии; Ерп – потенциал репассивации определяли графическим способом как первый изгиб на обратном ходе анодной кривой; Епо – потенциал питтингообразования (или потенциал пробоя) после катодной поляризации. В качестве примера на рис. 1 показана полная поляризационная кривая для сплава ССуЗ в среде электролита 3%-ного NaCl
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