CN116716520A - An aluminum alloy material that is resistant to fuel corrosion - Google Patents

Abstract

The invention belongs to the field of aluminum alloy materials, and specifically relates to an aluminum alloy material that is resistant to fuel corrosion, including the following components in weight percentage: Y≤0.8%; Fe0.4%-0.75%; Cu0.1%-0.4%; Mn0.8%-1.4%; Zn0.05%-0.1%; Si0.1%-0.3%; the balance is Al and inevitable impurities. The invention provides an aluminum alloy material formula that is resistant to fuel corrosion. Compared with the conventional Al-Mn rust-proof aluminum alloy, rare earth element Y is added, and the rare earth element Y is used to modify, purify and alloy the aluminum alloy. Chemical action is used to improve the corrosion resistance of the aluminum alloy. The aluminum alloy prepared by the invention has excellent corrosion resistance and relatively good mechanical properties.

Description

An aluminum alloy material that is resistant to fuel corrosion

Technical field

The invention belongs to the field of aluminum alloy materials, and specifically relates to an aluminum alloy material that is resistant to fuel corrosion.

Background technique

Explosion-proof covers for fuel storage and transportation containers are usually made of aluminum alloy materials. During long-term service, due to the influence of fuel, their corrosion resistance and mechanical properties will change, causing corrosion phenomena, which will reduce the strength of the material and affect the oil. The quality of the product seriously threatens the safety of the equipment.

Rare earth elements have modification, purification and alloying effects on aluminum alloys. These positive effects can effectively improve the properties of aluminum alloys. Metamorphism can refine the alloy grains and reduce the dendrite spacing of the alloy; purification refers to the use of the strong chemical affinity of rare earth elements to form compounds with impurities, which can effectively remove the impact of harmful impurities on aluminum alloys; rare earth elements are added to aluminum alloys A second phase is produced, and the mechanical properties of the aluminum alloy can be improved through alloying.

Contents of the invention

The present invention aims to provide an aluminum alloy material that can effectively resist fuel corrosion and solve the problem of reduced material strength due to long-term service when the aluminum alloy material is used for explosion-proof caps of fuel containers.

In order to achieve the above objects, the technical solutions of the present invention are as follows:

An aluminum alloy material resistant to fuel corrosion, characterized by including the following components in weight percentage: Y≤0.8%; Fe 0.4%-0.75%; Cu 0.1%-0.4%; Mn 0.8%-1.4%; Zn 0.05%-0.1%; Si 0.1%-0.3%; the balance is Al, and inevitable impurities.

Further, Y≤0.4%; Fe 0.4%-0.6%; Cu 0.1%-0.3%;

Further, Y≤0.2%; Fe 0.4%-0.5%; Cu 0.1%-0.2%

The benefits of the present invention are:

The invention provides an aluminum alloy material formula that is resistant to fuel corrosion. Compared with the conventional Al-Mn anti-rust aluminum alloy, rare earth element Y is added, and the rare earth element Y is used to modify, purify and alloy the aluminum alloy. Chemical effect to improve the corrosion resistance of aluminum alloys. The rare earth element Y can refine the aluminum alloy grains and reduce the dendrite spacing of the alloy, thereby enhancing the corrosion resistance of the aluminum alloy. In addition, the strong chemical affinity of rare earth elements can form compounds with impurities, thereby effectively removing the impact of harmful impurities on aluminum alloys. The microalloying of rare earth element Y with Mn, Fe, Zn and other elements can improve the corrosion resistance and mechanical properties of aluminum alloys. The aluminum alloy prepared by the invention has excellent corrosion resistance and relatively good mechanical properties.

Description of the drawings

Figure 1 is a comparison chart of polarization curves of Examples 1, 2 and Comparative Examples of the present application.

Detailed ways

In order to better illustrate the present invention, the embodiments of the present invention are described in detail below in conjunction with some specific examples. It should be understood that these detailed descriptions are only for better elaborating the advantages and features of the present invention, rather than for the claims of the present invention. Make restrictions.

Example 1

An aluminum alloy material that is resistant to fuel corrosion. The proportions of each component are as shown in the following table:

element Mn Fe Zn Si Cu Y Al content/% 1.2 0.6 0.06 0.18 0.14 0.2 margin

Example 2

An aluminum alloy material that is resistant to fuel corrosion. The proportions of each component are as shown in the following table:

element Mn Fe Zn Si Cu Y Al content/% 1.2 0.6 0.06 0.18 0.14 0.4 margin

Comparative ratio

This comparison example is a conventional Al-Mn rust-proof aluminum alloy material. The proportions of each component are shown in the following table:

element Mn Fe Zn Si Cu Al content/% 1.2 0.6 0.06 0.18 0.14 margin

The aluminum alloy material preparation method of the present invention is a conventional aluminum alloy casting method, which mainly includes steps such as smelting, homogenization treatment, rolling, and annealing treatment. The final product obtained after annealing is the final product without surface treatment.

The following experiments were performed on Examples 1, 2 and Comparative Examples:

Hardness measurement of as-cast structure: Cut the sample from the middle part of the ingot after homogenization treatment, and use a microhardness tester to conduct the hardness test. The test results are shown in Table 1.

Polarization curve test: take the final annealed sample, polish it and clean it. After welding the wire on the back of the sample, seal it with resin to ensure that the other surfaces except the working surface are isolated from the corrosive medium. The corrosion medium is 3.5wt% NaCl solution, the test temperature is 25°C, the polarization curve scanning speed is 1mV/s, and the scanning range is -1.7-0.5V. The obtained polarization curve is shown in the attached figure. From the polarization curve, the corrosion potential and corrosion current density of the sample in 3.5wt% NaCl solution can be obtained, as shown in Table 1.

Table 1

Example 1 Example 2 Comparative ratio As-cast hardness/HV 38.5 39.7 37.0 Self-corrosion potential/V -1.045 -1.149 -1.328 Self-corrosion current density/A·cm ^-2 7.734× ^10-6 2.095× ^10-5 1.12× ^10-4

As can be seen from Table 1, the microhardness of the conventional Al-Mn alloy after homogenization treatment is 37.0HV, and the hardness of the fuel corrosion-resistant aluminum alloy provided by the present invention is significantly increased. The electrochemical corrosion potential of the conventional Al-Mn alloy after the final annealing treatment is -1.328V. The electrochemical corrosion current density is 1.12×10-4A·cm-2. The electrochemical corrosion potentials of Examples 1 and 2 of the formulas provided by the present invention are They are -1.045V and -1.149V respectively, and the electrochemical corrosion current densities are 7.734×10-6A·cm-2 and 2.095×10-5A·cm-2 respectively. It can be seen from the above polarization curve test results that the fuel corrosion resistant aluminum alloy material provided by the present invention has a higher corrosion potential and a lower corrosion current density, which shows that the fuel corrosion resistant aluminum alloy provided by the present invention is compared with conventional Al -The corrosion resistance of Mn-based rust-proof aluminum alloys is significantly improved.

It should be noted that the above-mentioned embodiments are only used to better illustrate the present invention and cannot be considered as the protection scope of the present invention. The protection scope of the present invention shall be determined by the claims.

Claims (3)

1. An aluminum alloy material resistant to fuel corrosion, characterized in that it includes the following components in weight percentage: Y≤0.8%; Fe0.4%-0.75%; Cu0.1%-0.4%; Mn0.8% -1.4%; Zn0.05%-0.1%; Si0.1%-0.3%; the balance is Al and inevitable impurities. 2. An aluminum alloy material resistant to fuel corrosion according to claim 1, characterized in that Y≤0.4%; Fe0.4%-0.6%; Cu0.1%-0.3%. 3. An aluminum alloy material resistant to fuel corrosion according to claim 2, characterized in that Y≤0.2%; Fe0.4%-0.5%; Cu0.1%-0.2%.