Effects of Purge Gas Purity and Chelant Passivation on the Corrosion Resistance of Orbitally Welded 316L Stainless Steel Tubing Reprinted from the January/February, 1997 issue and the March/April, 1997 issues of Pharmaceutical Engineering™, Arc Machines, Inc. is pleased to offer the following two-part article: Part 1 describes the material, welding, and purging techniques, and the potentiodynamic polarization and auger electron spectroscopy methodology. The results of the electrochemical measurement of the pitting potentials of approximately 154 weldments of 316L stainless steel tubing, together with a visual description of the weldments, are presented. Part 2 details the results of auger surface line scans to show the surface element segregation and the depth profile for chromium, iron, oxygen and manganese, chromium to iron (Cr:Fe) surface ratios and depth profiles will be presented. The discussion and summary sections describe the significance of findings and practical applications of this knowledge. Click here for full article...

Passivation of 316L Orbital Tube Welds

PharmEng97.doc