Title:
COMBINED TREATMENT METHOD FOR IMPROVING CORROSION RESISTANCE OF METAL COMPONENT IN CHLORINE-CONTAINING SOLUTION
Document Type and Number:
WIPO Patent Application WO/2019/006901
Kind Code:
A1
Abstract:
A combined treatment method for improving the corrosion resistance of a metal component in a chlorine-containing solution. First, the metal component is placed in the chlorine-containing solution, the liquid level of the solution being higher than the surface of the component or a shock point by 1-2 mm, and the solution maintaining flowing circularly; large-area non-absorbing-layer laser overlapping shock strengthening treatment is used; when a laser pulse is irradiated on a target metal component, the surface of a metal substrate absorbs laser energy to evaporate and expand to form high-temperature and high-pressure plasma, the chlorine-containing solution limits the expansion of the plasma as a restraint layer, and a high-pressure shock wave is produced, the strength of the high-pressure shock wave being several to tens of GPa and far exceeding the yield strength of the metal component, so as to cause severe plastic deformation on the surface thereof; the crystal grains of the surface layer are refined or even nanosized, and high residual compressive stress is induced in a shock region; in addition, the chlorine ions in the chlorine-containing solution and the surface layer metal form a chlorine-containing passivation film under laser induction, so as to improve the surface corrosion resistance of the metal component; after the large-area non-absorbing-layer laser overlapping shock strengthening treatment is performed, surface polishing is performed on the surface layer of the metal component, and then large-area absorbing-layer laser overlapping shock strengthening treatment at room temperature is performed on the surface of the metal component, so as to further improve the corrosion resistance of the metal component. The method can be applied to the improvement in the corrosion resistance of metal components in chlorine-containing easy-to-corrode environments such as seawater.
Inventors:
XUE WEI (CN)
LUO KAIYU (CN)
LU HAIFEI (CN)
LU JINZHONG (CN)
LUO KAIYU (CN)
LU HAIFEI (CN)
LU JINZHONG (CN)
Application Number:
PCT/CN2017/105316
Publication Date:
January 10, 2019
Filing Date:
October 09, 2017
Export Citation:
Assignee:
INST LASER & OPTOELECTRONICS INTELLIGENT MANUFACTURING WENZHOU UNIV (CN)
UNIV JIANGSU (CN)
UNIV JIANGSU (CN)
International Classes:
C23C22/73; C21D10/00
Foreign References:
| CN1986841A | 2007-06-27 | |||
| EP0040092A1 | 1981-11-18 | |||
| US20090297720A1 | 2009-12-03 | |||
| CN105063547A | 2015-11-18 |
Other References:
XING, QINGPU ET AL.: "Effect of Laser Shock Processing on Electrochemical Corrosion Behavior of 2A02 Aluminum Alloy", CORROSION SCIENCE AND PROTECTION TECHNOLOGY, vol. 25, no. 5, 30 September 2013 (2013-09-30), pages 402 - 405
LUO, XINMIN ET AL.: "Surface Layer High-Entropy Structure and Anti-Corrosion Performance of Aero-Aluminum Alloy Induced by Laser Shock Processing", ACTA METALLURGICA SINICA, vol. 51, no. 1, 31 January 2015 (2015-01-31), pages 57 - 66
LUO, XINMIN ET AL.: "Surface Layer High-Entropy Structure and Anti-Corrosion Performance of Aero-Aluminum Alloy Induced by Laser Shock Processing", ACTA METALLURGICA SINICA, vol. 51, no. 1, 31 January 2015 (2015-01-31), pages 57 - 66
Attorney, Agent or Firm:
NANJING ZHENGLIAN INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)
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