A cr-fe-ni-based bulk amorphous alloy with excellent corrosion resistance and preparation method thereof
A technology of amorphous alloy and corrosion resistance, which is applied in the field of Cr-Fe-Ni-based bulk amorphous alloy and its preparation, can solve the problem of affecting thermal spraying temperature, time and other process parameters, increase of coating production cost, amorphous Solve problems such as low alloy viscosity, achieve good amorphous forming ability, high hardness, and excellent corrosion resistance
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Embodiment 1
[0028] Example 1: Cr 20 Fe 35 Ni 20 Mo 5 P 12 C 4 B 4
[0029] Step 1: Use Fe, Cr, Ni, Mo, C, B and iron-phosphorus alloy raw materials with a purity greater than 99.5 wt% to weigh and batch according to the designed alloy composition;
[0030] Step 2: Put the prepared raw materials into the crucible of the induction melting furnace, and obtain a master alloy ingot with uniform composition through induction melting in an Ar atmosphere for 3 times;
[0031] Step three (a), crush the master alloy ingot and put it into a quartz tube, and adopt a copper injection molding process, that is, in an Ar atmosphere, the master alloy is heated to a molten state by induction melting, and then the alloy is liquidized by high-pressure gas Spray into the copper mold to prepare bulk amorphous alloy bars with a diameter of 1-2 mm and a length of 45 mm;
[0032] Step three (b), crush the master alloy ingot and put it into the powder making equipment. Under Ar atmosphere, first heat the master alloy to a...
Embodiment 2
[0039] Example 2: Cr 25 Fe 30 Ni 20 Mo 5 P 12 C 4 B 4
[0040] The preparation, structure characterization and performance evaluation process of the alloy of Example 2 are the same as those of Example 1. According to XRD results, the alloy can be formed into amorphous alloy rods with a diameter of 1 mm, and powders with a particle size of 65 μm. From figure 2 To determine the alloy’s T g , T x And Δ T x They are 461 ℃, 526 ℃ and 65 ℃ respectively. The electrochemical potential polarization curve shows that the alloy of Example 2 has self-passivation at room temperature and 80 ℃ in 1 N sulfuric acid solution and 1 N hydrochloric acid solution at room temperature, and E corr with E pit Much higher than SUS316L stainless steel, and I corr with I pass It is much lower than that of stainless steel, which indicates that the corrosion resistance of the alloy of Example 2 is better than that of stainless steel at room temperature or in an acidic environment at 80°C. In 1 N sulfuric...
Embodiment 3
[0042] Example 3: Cr 25 Fe 20 Ni 20 Mo 15 P 12 C 4 B 4
[0043] The preparation, structure characterization and performance evaluation process of the alloy of Example 3 are the same as those of Example 1. XRD results ( figure 1 ) Shows that the alloy can be formed into amorphous alloy bars with a diameter of 1 mm, and can also be formed into an amorphous powder with a diameter of 65 μm. From figure 2 To determine the alloy’s T g , T x And Δ T x They are 520 ℃, 571 ℃ and 51 ℃ respectively. Figure 3-5 The potentiodynamic polarization curve shown shows that the alloy has self-passivation at room temperature and 80 ℃ in 1 N sulfuric acid solution and 1 N hydrochloric acid solution at room temperature, and E corr with E pit Much higher than SUS316L stainless steel, and I corr with I pass It is much lower than that of stainless steel, which indicates that the corrosion resistance of the alloy of Example 3 is better than that of stainless steel whether at room temperature or in an...
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