INVESTIGATION OF THE INTERGRANULAR CORROSION OF LEAD-ANTIMONY GRID ALLOYS
NAVAL RESEARCH LAB WASHINGTON DC
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Microscopic examination of grid sections that had been in service for periods up to 10 years indicated that the ultimate cause of grid failure was an intergranular type of stress corrosion. While the overall corrosion resistance indicated the possibility of many additional years of service, this intergranular corrosion at isolated points had in many cases completely severed the grid member. It appeared that this corrosion was caused by a combination of stress developed in the corrosion product and microporosity in the casting. Two distinct corrosion mechanisms were observed. One type depended upon fairly acidic conditions, and the corrosion product was a hard film of lead dioxide which appeared to offer some protection to the underlying metal. The other type was generated where acid concentrations were low and was much more destructive. The corrosion product formed in this case varied from black to white and did not protect the underlying metal.
- Electrochemical Energy Storage
- Properties of Metals and Alloys