PRACTICAL CORROSION PROBLEMS IN RELATION TO WELDED JOINTS. 1. SPECIAL CHARACTERISTICS OF THE WELDING PROCESS WHICH CAN CAUSE CORROSION PROBLEMS

AN EXPLANATION IS MADE OF HOW WELDING MAY LEAD TO CORROSION PROBLEMS IN STRUCTURAL ENGINEERING. A TABLE IS GIVEN SUMMARIZING CORROSION PROBLEMS IN WELDED JOINTS OF VARIOUS MATERIALS, POSSIBLE CAUSES OF THESE PROBLEMS AND THEIR REMEDIES. THE MECHANISM BY WHICH CORROSION OCCURS IS ELECTROLYTIC IN CHARACTER. AT CERTAIN POINTS IN THE STRUCTURE, REFERRED TO AS ANODIC REGIONS, METAL GOES INTO SOLUTION IN THE FORM OF POSITIVELY CHARGED PARTICLES CALLED IONS, LEAVING A NEGATIVE CHARGE ON THE METAL WHICH HAS TO BE DISSIPATED BY THE CONSUMPTION OF ELECTRONS IN A CHEMICAL REACTION AT OTHER POINTS ON THE METAL SURFACE CALLED CATHODIC REGIONS. THUS AN ELECTROLYTIC CELL IS SET UP INVOLVING: (1) THE MOVEMENT OF IONS THROUGH A CONDUCTING SOLUTION, THE ELECTROLYTE, (2) THE MOVEMENT OF ELECTRONS THROUGH THE METAL BETWEEN THE ANODIC AND CATHODIC REGIONS, (3) AN ANODIC REACTION, AND (4) A CATHODIC REACTION. PREVENTION OF THE OCCURRENCE OF ANY ONE OF THESE WOULD PREVENT CORROSION.

• Supplemental Notes:
  • Vol 2, No 2, PP 34-40, 9 FIG, 2 TAB, 11 REF
• Authors:
  • BAKER, R G
  • Whitman, J G
• Publication Date: 1967-3

Media Info

• Serial:
  • British Corrosion Journal

Subject/Index Terms

• TRT Terms: Anodes; Cathodes; Corrosion; Corrosion protection; Electrolytic cells; Failure; Galvanic corrosion; Ions; Joints; Welds
• Uncontrolled Terms: Welded joints
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00216321
• Record Type: Publication
• Files: TRIS
• Created Date: Aug 12 1970 12:00AM