Influence of Aluminum Additive on Anodic Stability of Lead Babbitt B(PbSb15Sn10) in an Aqueous Solution of NaCl

A distinctive feature of all types of babbitts is their low fatigue resistance index, which can reduce the optionality of bearings. For this reason, the material is used on liners, the design of which provides for their installation in a housing made of ferrous metal (cast iron) or bronze. Inserts with thin walls are installed in the internal combustion engine using bimetal stamping and continuous casting. The service life of bearings is determined taking into account the size of the babbitt layer poured onto the metal base. In this case, the service life of the liner increases as the babbitt layer decreases. It is known that corrosion destroys metal, but it is difficult to imagine how much overall damage it causes. According to experts from various countries, these losses in industrialized countries range from 2 to 4% of the gross national product. At the same time, metal losses, including a mass of failed metal structures, products, and equipment, amount to 10 to 20% of annual steel production. The paper presents the results of an experimental study of the anodic behavior of lead babbitt B(PbSb15Sn10) doped with aluminum from 0.1 to 2.0 wt. %, in an aqueous solution of NaCl. It has been shown that the addition of aluminum reduces the corrosion rate of lead babbitt B(PbSb15Sn10) by 20…30%. With increasing aluminum concentration in the initial alloy, the potentials of corrosion, pitting and repassivation shift to a positive range of values. An increase in the concentration of chloride ion in a NaCl solution promotes an increase in the corrosion rate of alloys, which is accompanied by a shift to the negative region of the main electrochemical potentials of the alloys.

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