A series of model experiments carried out in connection with the evaluation of a commercial corrosion case indicate that the perforation of tinplate by aggressive products in internally lacquered cans quite often should be regarded as the combined effect of two separate mechanisms. One is the penetration of hydrogen into the base steel, the other being the conventional electrochemical dissolution of steel pre-activated by the former mechanism, Also the formation of the so-called "sulphide black" by sulphur-bearing low-acid food products is a consequence of such dual attack on the steel. The influence of some steel parameters and of certain product components on the hydrogen effect has been studied.
展开▼
