The critical temperature for initiation of corrosion, Tinit, for weldments of variable quality on two high alloy stainless steels has been investigated in natural sea water, 3 % NaCl-solution and in 6 % FeCl3 -solution. Most of the tests have been carried out with the specimens under potentiostatic control and with stepwise increase of temperature. The influence of potential and temperature-increase rate have been investigated. Evaluation of results based on the free potential on passive stainless steels in natural sea water and other chloride containing solutions have been performed.

The critical temperature determinded in natural sea water and 3 % NaCl-solution when the specimens were held at potentials +400 - +600 mV (SCE) showed no significant difference from results obtained in 6 % ferric chloride solution.

Subject
Test methods, Water, Materials, Critical temperature, Stainless alloys, Corrosion rate, Weldments, Welding, Corrosion initiation, Electric potential, Stainless steel, Electrochemical potential, Corrosion potential
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1988
Association for Materials Protection and Performance (AMPP)
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