Role of B/sup +/ and N/sub 2//sup +/ ion implantation in the corrosion behavior of high purity iron and 440 C stainless steel

Thesis/Dissertation · Tue Jan 01 00:00:00 EST 1985

OSTI ID:5348723

Kim, H J

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
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
IRON
CORROSION
ION IMPLANTATION
SODIUM CHLORIDES
CORROSIVE EFFECTS
STAINLESS STEELS
SULFURIC ACID
BORON IONS
CRYSTAL STRUCTURE
KEV RANGE 10-100
MOLECULAR IONS
NITROGEN IONS
SURFACES
ALKALI METAL COMPOUNDS
ALLOYS
CHARGED PARTICLES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
ELEMENTS
ENERGY RANGE
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
IONS
IRON ALLOYS
IRON BASE ALLOYS
KEV RANGE
METALS
SODIUM COMPOUNDS
STEELS
TRANSITION ELEMENTS
360106* - Metals & Alloys- Radiation Effects
360105 - Metals & Alloys- Corrosion & Erosion