It is possible to determine the pitting corrosion resistance of a stainless steel in a given solution of a chemical process by electrochemical techniques. However, it is known that the result is influenced by the test parameters. The aim of this study was to determine the influence of the main test parameters, scan rate, i max ; agitation/flow rate, and surface pretreatment on the electrochemical response of 316Ti/1.4571 stainless steel in an acidic (250 ppm Cl The main result was that the agitation/flow rate had the greatest impact, with stagnant conditions giving very conservative results, followed by i max , which had an influence on the repassivation potential.

Quality Management during the Fabrication of Chemical Equipment Made of Special Materials Optimizing a material's resistance to corrosion by the addition of alloying elements up to their solubility limits will make it increasingly difficult to use these frequently unstable alloys for the manufacture of chemical plant. The requirements these materials have to meet in the manufacture of chemical plant in terms of manufacturing technology and quality management, are becoming increasingly stringent. The current situation, for example in the manufacture of domed heads of pressure vessels, forgings, heat exchangers, and filter screens with a high specific surface area as a constituent part of stirred suction filters using advanced metallic materials, is not very satisfactory. Results of fabrication tests necessary for pressure vessel manufacture as well as in‐service failures frequently demonstrate insufficient expertise of workshops dealing with high‐alloy stainless steels and nickel‐based materials. That the in‐service failure of compoents clearly leads to considerable costs due to maintenance, delays in supply, and production downtimes. The economic consequences can be substantial. The aim of this paper is to highlight sensitive areas by demonstrating the impact of unintentional and unnoticed fabrication‐related changes in welding parameters and to provide information on easily applicable methods of monitoring techniques.