Role of B/sup +/ and N/sub 2//sup +/ ion implantation in the corrosion behavior of high purity iron and 440 C stainless steel
The change in the surface composition and structure by ion implantation was examined to determine the mechanisms by which ion implantation affected the corrosion properties of the substrate. The corrosion behavior of ion implanted samples tested in deaerated 1 N H/sub 2/SO/sub 4/ and 0.1 M NaCl solutions was compared with that of the unimplanted samples measured by the potentiodynamic and potentiostatic polarization methods. Boron implantation into iron and 440 C stainless steel with a fluence of 2 x 10/sup 17/ ions cm/sup -2/ at 40 keV changed the surface structure to either an amorphous or a fine microcrystalline state. Nitrogen implantation with a fluence of 1 x 10/sup 17/ and 2.5 x 10/sup 17/ ions cm/sup -2/ at 50 keV and 100 keV, respectively, produced nitrides in iron and the matrix of 440 C. The higher dose and higher voltage implantation of N/sub 2//sup +/ produced a more disturbed surface layer than did implantation at the other condition. Implantation of boron into iron increased the corrosion resistance of the iron in deaerated 1 N H/sub 2/SO/sub 4/. However, the same surface showed a decrease in the pitting resistance in deaerated 0.1 M NaCl when compared to the unimplanted iron. Nitrogen implantation with a fluence of 2.5 x 10/sup 17/ ions cm/sup -2/ at 100 keV produced a significant increase in both general and pitting corrosion resistance of iron. Nitrogen implantation with a fluence of 1 x 10/sup 17/ ions cm/sup -2/ at 50 keV produced little or no improvement in the corrosion resistance of iron in deaerated 1 N H/sub 2/SO/sub 4/, and a tendency for increased pitting in deaerated 0.1 M NaCl. Boron implantation into AISI 440C stainless steel markedly increased the corrosion resistance in deaerated 1 N H/sub 2/SO/sub 4/.
- Research Organization:
- Georgia Inst. of Tech., Atlanta (USA)
- OSTI ID:
- 5348723
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360105 -- Metals & Alloys-- Corrosion & Erosion
360106* -- Metals & Alloys-- Radiation Effects
ALKALI METAL COMPOUNDS
ALLOYS
BORON IONS
CHARGED PARTICLES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM ALLOYS
CORROSION
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
CRYSTAL STRUCTURE
ELEMENTS
ENERGY RANGE
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
ION IMPLANTATION
IONS
IRON
IRON ALLOYS
IRON BASE ALLOYS
KEV RANGE
KEV RANGE 10-100
METALS
MOLECULAR IONS
NITROGEN IONS
SODIUM CHLORIDES
SODIUM COMPOUNDS
STAINLESS STEELS
STEELS
SULFURIC ACID
SURFACES
TRANSITION ELEMENTS