A LIGHT METAL OR ALLOY MATRIX WORKPIECE HAVING TAILOR COATED CORROSION RESISTANT LAYERS AND METHODS FOR MAKING THE SAME

Title:

A LIGHT METAL OR ALLOY MATRIX WORKPIECE HAVING TAILOR COATED CORROSION RESISTANT LAYERS AND METHODS FOR MAKING THE SAME

Document Type and Number:

WIPO Patent Application WO/2016/161559

Kind Code:

A1

Abstract:

Customizable methods of protecting select regions of a light metal or alloy workpiece, such as a wheel (10), from corrosion are provided. The light metal or alloy may be magnesium, aluminum, or titanium. A first region (50) of the exposed surface (40) is identified that has increased exposure to corrosive agents in an external environment (in service conditions) as compared to a second region (52). Thus, a corrosion resistant coating is selectively formed over the first region (50) of the exposed surface (40). The second region (52) may have a second distinct corrosion resistant coating. Methods for selectively and efficiently forming such corrosion resistant systems are provided. In certain methods, the locations where the corrosion resistant coating is applied are controlled by immersing only select portions of or selectively masking the workpiece in a micro-arc oxidation electrolyte bath. In other methods, the thicknesses of the coatings are locally tailored by controlling the electric field.

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Inventors:

LIU MING (CN)
GE YANFENG (CN)

Application Number:

PCT/CN2015/075998

Publication Date:

October 13, 2016

Filing Date:

April 07, 2015

Export Citation:

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Assignee:

GM GLOBAL TECH OPERATIONS LLC (US)
NANJING HAORANG ENV SCIENCE & TECH CO LTD (CN)
LIU MING (CN)

International Classes:

C25D11/02; B32B5/00; B32B5/14; B60B1/00; C25D11/00; F04D29/00; F04D29/28; F04D29/30

Foreign References:

CN102072193A	2011-05-25
CN202106791U	2012-01-11
US7713618B2	2010-05-11

Attorney, Agent or Firm:

CHINA PATENT AGENT (H.K.) LTD. (Great Eagle Centre23 Harbour Road, Wanchai, Hong Kong, CN)

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