Effect of laser surface modification on the corrosion resistance of Alloy 600

Cited 15 time in webofscience Cited 24 time in scopus
  • Hit : 520
  • Download : 174
To improve the corrosion resistance of Alloy 600, a typical alloy for steam-generator tubing in nuclear power plants, the surface of the alloy was modified by melting or alloying with a continuous CO, laser beam. In laser surface melting (LSM), a rapidly solidified surface layer of 300 mu m in thickness was obtained. Anodic polarization measurements showed that the corrosion resistance of the laser-surface-melted specimen was improved slightly. This might be attributed to the elimination of microstructural inhomogeneities, such as precipitates, inclusions and segregated impurities pre-existing at grain boundaries. For laser surface alloying (LSA), chromium was electroplated on the surface of the specimens before laser-beam irradiation. The alloyed layer showed a pore- and oxide-free and very homogeneous microstructure, with a chromium composition of 28-30 at%. The corrosion properties of the alloyed specimen were examined by anodic polarization, electrochemical potentiodynamic reactivation, the modified Huey and slow-strain-rate tests. The properties, in particular intergranular corrosion resistance, were significantly improved compared with those of as-received or LSM specimens. The improvement in corrosion resistance might result from the easy formation of a more stable passive film on the alloyed surface layer with high chromium content. (C) 1998 Elsevier Science S.A. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
1998-09
Language
English
Article Type
Article
Keywords

THERMAL STABILIZATION; STAINLESS-STEEL; HEAT-TREATMENT; SCC BEHAVIOR; CRACKING; WATER; MICROSTRUCTURE; SUSCEPTIBILITY; HYDROGEN; STEAM

Citation

SURFACE & COATINGS TECHNOLOGY, v.107, no.2-3, pp.94 - 100

ISSN
0257-8972
DOI
10.1016/S0257-8972(98)00552-0
URI
http://hdl.handle.net/10203/8137
Appears in Collection
MS-Journal Papers(저널논문)
Files in This Item
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 15 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0