Research and Development of Welding Materials For Low-temperature Steel and Corrosion Evaluation Methods
The corrosion performance of marine engineering welded structures is of significance for the offshore engineering's safety,however,for that there is hardly any scientific and systematic evalua-tion methods.Herein,two kinds of welded structures are designed and made with two solder alloys of dif-ferent composition.Then the corrosion performance of the two coupons were comparatively evaluated by immersion in an artificial seawater containing corrosive bacteria.It is surprisingly found that macroscopic testing results(such as electrochemical impedance,massless testing,etc.)and microscopic testing re-sults(micro-area electrochemical scanning)did not exactly match each other.Therefore,it is not rigorous to evaluate the corrosion resistance of welded structural parts only via the conventional electrochemical method or massless testing,but the microscopic electrochemical testing method should also be applied.Combined with the macroscopic and microscopic corrosion tests,we can be more accurately matching and selecting the base metal and solder of the welded structure,which will guide us to improve its overall seawater corrosion resistance.
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