![]() ![]() ![]() With this combination the affect of relative surface area on corrosion is important.Ī large area of ‘cathode’ relative to ‘anode’ will accelerate the anodic corrosion. Corrosion risks with aluminium and stainless steel in contactĪluminium and stainless steel together also appears to be a bi-metallic corrosion risk, from the ‘nobility’ table. In these situations, precautions such as insulating barriers are usually considered adequate to avoid bimetallic corrosion in most practical situations. Galvanised steel in contact with stainless steels is not normally considered to be a serious corrosion risk, except possibly in severe (marine type) environments. Corrosion risks with galvanised steel and stainless steel in contact If the metals are dry, bimetallic (galvanic) corrosion cannot occur. Seawater or salt laden moist air is more of a risk than contact with rain water or towns water. The more electrically conductive the liquid is, the greater the danger of corrosion. To complete the cell, a conductive liquid must bridge the contact metals. So, for example, stainless steel in contact with copper is less likely to be a risk than when it is in contact with aluminium or galvanised (zinc coated) steel. The further apart the metals are, in terms of relative potentials, the greater the driving force in a cell. ![]()
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