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Anti-contact corrosion tial-based alloy coating and preparation method thereof

A contact corrosion and base alloy technology, applied in metal material coating process, coating, melt spraying and other directions, can solve problems such as contact corrosion of aluminum alloy/titanium alloy dissimilar metals, and improve the overall performance of the coating. Electrode potential, the effect of reducing self-corrosion current

Active Publication Date: 2018-02-06
ACADEMY OF ARMORED FORCES ENG PLA
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to provide a kind of anti-contact corrosion TiAl-based alloy coating and its preparation method for the problem of contact corrosion of aluminum alloy / titanium alloy heterogeneous metals

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0020] The anti-contact corrosion TiAl-based alloy coating of this embodiment is composed of 45at% Al, 2at% Nb, 10at% V, 1at% Cr and the rest of Ti (hereinafter all abbreviated as Ti-45Al-2Nb- 10V-1Cr).

[0021] The preparation method of the contact corrosion-resistant TiAl-based alloy coating of the present embodiment is as follows:

[0022] ①Mix the master alloys AlNb, AlV, AlCr, Al particles and high-purity sponge Ti according to the above atomic percentages, put them into a vacuum arc melting furnace and melt them into bulk materials, and then use gas atomization powder making equipment to make the above bulk materials The powder material is sieved to obtain a spray powder with a particle size of 400 mesh to 800 mesh powder material ≥ 95wt%.

[0023] ② The spray powder obtained in step ① is sprayed on the surface of the 5083 aluminum alloy substrate by low-temperature supersonic spraying technology to obtain a TiAl-based alloy coating resistant to contact corrosion.

[0...

Embodiment 2

[0026] The coating compositions of Example 2 and Example 3 are shown in Table 1, and the preparation method thereof is basically the same as that of Example 1, and the differences are shown in Table 1.

[0027] Table 1

[0028]

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PUM

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Abstract

The invention discloses a TiAl-based alloy coating resistant to contact corrosion and a preparation method of the TiAl-based alloy coating. The coating is composed of the following elements including, by atom percentage, 44-47at% of Al, 2-4at% of Nb, 4-10at% of V, 0-2.5at% of Cr, 0-0.5at% of B and the balance Ti. According to the coating, intermediate alloy AlNb, AlV and AlCr, TiB2, Al particles and high-purity sponge Ti are mixed and then are prepared into spraying powder; and then the spraying powder is sprayed onto the surface of an aluminum alloy base through a low-temperature supersonic spraying technology. The bonding strength of the coating can reach 30 MPa or above, after the coating is prepared on the surface of an aluminum alloy, the electrode potential of the surface of the aluminum alloy can be improved, the self-corrosion current can be reduced, the contact corrosion sensitivity between the aluminum alloy and a titanium alloy can be reduced, and therefore the aluminum alloy can make direct contact with the titanium alloy for use, and the contact corrosion preventing requirement of aluminum alloy / titanium alloy dissimilar metal is met.

Description

technical field [0001] The invention relates to a TiAl-based alloy coating and a preparation method thereof, in particular to an anti-contact corrosion TiAl-based alloy coating and a preparation method thereof. Background technique [0002] There are many aluminum alloy / titanium alloy heterogeneous metal direct contact structures in aircraft and ships. During the service of these aircraft and ships in the marine environment, the aluminum alloy electrode potential (-1.66V) is lower than the titanium alloy electrode potential. (-1.63V), a potential difference is formed, and the passivation film on the surface of the aluminum alloy is unstable. In addition, the marine atmospheric environment with high humidity and high salt fog provides a medium condition for corrosion, and it is easy to make the aluminum alloy parts with low electrode potential Severe contact corrosion (also known as galvanic corrosion) occurs. Since contact corrosion belongs to local corrosion, it is difficu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C1/03B22F9/08C23C4/08C23C4/12
CPCB22F9/082B22F2009/0824C22C1/026C22C1/03C22C21/00C22C30/00C23C4/08C23C4/12
Inventor 王晓明朱胜韩国峰张垚杜文博赵阳王启伟任智强常青陈永星周超极
Owner ACADEMY OF ARMORED FORCES ENG PLA
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