JPH06299333A - Zn alloy plated metallic material excellent in corrosion resistance - Google Patents

Abstract

PURPOSE:To obtain a highly corrosion resistant metallic material withstanding use even in a severe corrosive environment by forming a prescribed amt. of a plating layer of a Zn-Ti-Mg alloy having a prescribed compounding ratio on the surface of a metallic material. CONSTITUTION:An alloy plating layer is formed on the surface of a metallic material by vapor phase plating such as vacuum deposition or ion plating by 0.1-60g/m<2> coating weight. This plating layer is made of an alloy having a compsn. consisting of 5-60wt.%, in total, of 0.5-50wt.% Ti and 0.5-40wt.% Mg and the balance Zn.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Zn alloy-plated metal material which is used in a severe corrosive environment such as an outer panel for an automobile and is particularly required to have excellent corrosion resistance.

The metallic material to which the present invention is applied is F
e, Fe-based alloys, non-ferrous metals such as Al, and their alloys are included.

[0003]

2. Description of the Related Art Zn plating has hitherto been widely regarded as the most economical and effective method for preventing corrosion of metal products in the atmosphere.

Furthermore, Zn--Ni having improved corrosion resistance
Various Zn alloy plated steel sheets such as Zn-based and Zn-Fe-based have been proposed.

[0005]

However, in recent years, the requirements for the rust preventive ability have become more severe, and higher durability in a severe corrosive environment is desired.

In order to solve this problem, the present invention provides
A plating layer containing 0.5 to 50% by weight of Ti, 0.5 to 40% by weight of Mg, 5 to 60% by weight of total of Ti and Mg, and the balance being substantially Zn is 0.1 to 60 g / m. ^2. To provide a Zn alloy plated metal material having excellent corrosion resistance, which is obtained by forming on the surface of a metal material.

[0007]

The gist of the present invention, which has solved the above problems, is that Ti: 0.5 to 50% by weight and Mg: 0.5.
-40% by weight, and the total amount of Ti and Mg: 5-60% by weight
The plating layer containing Zn and the balance being substantially Zn.
˜60 g / m ² , a Zn alloy-plated metal material having excellent corrosion resistance, which is formed on the surface of the metal material.

[0008]

In order to solve the above-mentioned problems, based on Zn plating, various additive elements were studied,
Zn alloy plating having excellent corrosion resistance can be realized by combining Ti and Mg as additional elements, and the additive element concentration is 0.5 to 50% by weight of Ti and 0.5 to 50% by weight of Mg.
The present invention has been completed by finding that 40% by weight, 5 to 60% by weight in total, is suitable.

The composition range is limited for the following reasons.

If both Ti and Mg are less than 0.5% by weight, the effect is not exerted and it is meaningless to add.

To obtain the full effect of the present invention, T
Both i and Mg are preferably added in an amount of more than 5% by weight.

When Ti exceeds 50% by weight, the sacrificial anticorrosive action of the Zn alloy plating is impaired, which adversely affects the corrosion resistance of the raw material metal.

Further, Mg is added in an amount of 0.5 to 40% by weight so that Ti + Mg falls within the range of 5 to 60% by weight.

Even if the amount of addition exceeds 40% by weight,
Even if the total amount of Ti and Ti exceeds 60% by weight, the effect is almost unchanged, so the content is limited to this range.

Next, regarding the basis weight, it is 0.1 to 60 g.
It is limited to the range of / m. If the amount is less than 0.1 g / m ² , the effect as plating cannot be exhibited, and if the amount exceeds 60 g / m ² , problems such as poor workability occur, so the range is set to this range.

As a plating method, a vapor phase plating method such as a vacuum vapor deposition method or an ion plating method can be adopted.

In the electroplating method and the hot dipping method, Zn, T
Although it is not possible to perform simultaneous plating due to the difference in the metal characteristics of i and Mg, according to the vapor phase plating method, Zn, T
It is possible to plate i and Mg uniformly.

For example, in the vacuum vapor deposition method or the ion plating method, Zn, T is formed under a vacuum of 10 ⁻² Torr or less.
The plated metal material can be produced by evaporating i and Mg from the individual crucibles and controlling the evaporation amount in each crucible so as to have a predetermined plating composition.

In the sputtering method, it is possible to produce the plated metal material by using a Zn--Ti--Mg target having the same surface area as the predetermined plating composition.

[0020]

[Examples] A cold rolled steel sheet having a thickness of 0.7 mm and an aluminum alloy sheet having a thickness of 1.0 mm were used as raw materials and Zn-Ti- having various compositions
A Mg alloy plating layer was formed.

Zn-Ti-Mg alloy plating was prepared by a vacuum deposition method or an ion plating method.

By controlling the evaporation amounts of Zn, Ti, and Mg, respectively, Z having a predetermined basis weight and Ti and Mg concentrations can be obtained.
An n-Ti-Mg alloy plating was obtained. The details are shown in Table 1.

The corrosion resistance is evaluated by a salt spray test (JIS Z
-Based on 2371), it was judged by the initial rust generation time of the raw metal. The results are shown in Table 1.

0.5 to 50% by weight of Ti and 0.5 of Mg
It can be seen that a metal material containing 0.1 to 40% by weight, a total of 5 to 60% by weight, and 0.1 to 60 g / m ^{2 of} a plating layer with the balance substantially Zn is excellent in corrosion resistance.

[0025]

[Table 1]

[0026]

As described above, according to the present invention, a Zn alloy plated metal material having excellent corrosion resistance can be realized.
It can respond to the demand for highly corrosion-resistant metal materials that can withstand use in severely corrosive environments.

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[Procedure amendment]

[Submission date] June 14, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction content]

[0025]

[Table 1]

Claims (1)

[Claims] 1. Ti: 0.5 to 50% by weight, Mg: 0.
A plating layer containing 5 to 40% by weight, the total amount of Ti and Mg: 5 to 60% by weight, and the balance being substantially Zn.
A Zn alloy-plated metal material having excellent corrosion resistance, which is formed on the surface of a metal material in an amount of 1 to 60 g / m ² .