Chemistry: electrical and wave energy – Processes and products
Patent
1989-05-02
1990-02-06
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
204 58, 204434, G01N 2746
Patent
active
048986461
ABSTRACT:
This invention relates to a process for identifying the external surface or surfaces of an Al alloy of a homogeneous or composite material by electrochemical means. This method involves forming an anodic layer, in situ, on the products to be identified, by electrolysis under predetermined conditions and following or plotting the development of the voltage U at the terminals of the electrolyzer as a function of time t during an intentiostatic test. The shape and relative position of curves U=f(t), thus obtained, allows the various alloys tested to be identified from a comparison of the derived curve from a curve U=f(t) derived from a known sample. The present method has advantages over the earlier methods of marking in that it provides: non-destructive method employable in situ on products which may have large dimensions (coils, plates, sheets, etc.); almost instantaneous identification; high reliability; and is simple and economic to use.
REFERENCES:
patent: 2531747 (1950-11-01), Stearn
patent: 3428532 (1969-02-01), Banks
Joseph V. Petrocelli et al., The Electrochemical Soc., Preprint 85-6, pp. 51-70 (1944).
N. A. Gordienko, Theor. & Exp. Chem. (U.S.A.), vol. 7, No. 5, pp. 581-584, (Sep.-Oct. 1971).
Bommier Christophe
Gimenez Philippe
Kucza Jean-Claude
Rabiet Jacques
Kaplan G. L.
Pechiney
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