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Some aspects of grid corrosion in the lead-acid batteries

✍ Scribed by M. Maja; P. Spinelli


Publisher
John Wiley and Sons
Year
1985
Tongue
German
Weight
729 KB
Volume
36
Category
Article
ISSN
0947-5117

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✦ Synopsis


Corrosion of pasted and unpastcd grids and of different lead alloys has been investigated by means of weight loss measurements and electrochemical tests. Pasted grids were analysed after several days immersion in sulphuric acid of different densities in the range 1.10-1.32 g Some grids withdrawn from plates at various stages of manufacturing and from batteries stored for different timcs were also examined.

Corrosion testing on lead-alloys sheet samples included cyclic voltammetry, linear sweep voltammetry, potentiostatic tests and photocurrent measurements. The results evidenced the importance of the plates conversion process on subsequent corrosion of the grids. Antimonial grids appear to be more corrodible than lead-tin-calcium grids. Mechanical working greatly affects localized corrosion in the case of expanded grids. Corrodibility largely increases by decreasing the sulphuric acid density. Differences in the corrosion testing methods are discussed. Die Korrosion von Elektrodcngittcrn mit und ohne Pastenaultrag ist fur verschiedcne Bleilcgicrungcn gravimetrisch und elcktrochcmisch untersucht worden. Die mit Pasten beschichtctcn Gitter wurden nach mehrtagiger Verweilzcit in Schwcfclsaure (1,lO-1.32 g cm') analysiert; zusatzlich wurden auch Gitter in verschiedencn Stadien der Gitterhcrstellung und aus unterschiedlich lange gelagerten Probcn untersucht. Die Korrosion der Blcilegierungsbleche wurde mittels zyklischer Voltammetrie, hearer Voltammetrie, potentiostatischer Untersuchungen und durch Messen des Fotostromes untcrsucht. Die Ergebnisse zeigen die Bcdcutung dcr Konvcrsionsbehandlung der Platten auf die anschlicl3ende Korrosion der Gitter. Antimonhaltige Gitter scheinen starker korrosionsanfallig zu sein, als solche mit Blei, Zinn und Calcium. Im Falle von Streckgittcrn wird durch die mcchanische Verformung die drtliche Korrosion sehr begiinstigt. AuBerdcm wird die Korrosionsanfdligkeit bei abnchmender Schwefelsauredichte wesentlich grdkr. Die unterschiedlichen Ergebnisse der verschiedenen Priifmethodcn werden erortert.


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