Environment-friendly chromium-ion-free aqueous phosphate-based silicon-aluminizing slurry
A chromium ion, environment-friendly technology, applied in metal material coating process, coating, solid-state diffusion coating and other directions, can solve the problem of containing hexavalent chromium ions and other toxic substances, and is suitable for large-scale production and has a simple process. , the effect of low cost
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Embodiment 1
[0027] First, mix the liquid phase and aluminum powder in a ratio of 1ml: 1g evenly, and add 1 / 3 of the liquid phase volume of silica sol to form a slurry, which is uniformly stirred by mechanical stirring and ultrasonic vibration before use. The sample is nickel-based superalloy K438, its nominal composition is: Cr16.34, Co 8.38, Al 4, Ti 3.81, W 2.66, Mo 1.77, Ta 1.75, Nb 0.76, C 0.16, B 0.01, Ni balance (wt %), the size is 20×10×3mm, after the surface is sandblasted, the slurry is sprayed onto the surface of the sample with a spray gun. The impregnated layer is obtained through subsequent heating and curing and high temperature diffusion process.
[0028] The sample curing process of the deposition slurry is to stay at 40-90°C for 30 minutes, and to stay at 150°C for 30 minutes. The high-temperature diffusion was carried out at 1000°C under the protection of argon for 2 h. The scanning electron microscope cross-sectional photos of the obtained coating are as follows: fig...
Embodiment 2
[0030]First, the liquid phase and aluminum powder are mixed in a ratio of 1ml: 1g to form a slurry, which is uniformly stirred by mechanical stirring and ultrasonic vibration before use. The sample is a nickel-based superalloy GH3128, and its nominal composition is: Cr 19.0-22.0, W 7.5-9.0, Mo 7.5-9.0, Al 0.4-0.8, Ti 0.4-0.8, Fe≤0.2, B≤0.005, Zr≤0.06 , Ce ≤ 0.05, Mn ≤ 0.05, Si ≤ 0.8, P ≤ 0.013, S ≤ 0.0013, Ni balance (wt%), the size is 20×10×3mm, after the surface is sandblasted, spray the slurry with a spray gun to the sample surface. The impregnated layer is obtained through subsequent heating and curing and high temperature diffusion process.
[0031] The sample solidification process parameters and process of the deposition slurry are the same as in Example 1, the high-temperature diffusion temperature is 1000° C., and the time is 2 hours. The process is the same as in Example 1. The scanning electron microscope cross-sectional photos of the obtained coating are as follo...
Embodiment 3
[0033] First, the liquid phase and aluminum powder are mixed in a ratio of 1ml: 1g to form a slurry, which is uniformly stirred by mechanical stirring and ultrasonic vibration before use. The sample is TP304 stainless steel, its nominal composition is: Ni 8.00-11.00, Cr 18.00-22.00, Fe≤0.08, Mn≤2.00, Si≤1.00, P≤0.045, S≤0.030, Fe balance (wt%), size It is 20×10×3mm. After the surface is sandblasted, the slurry is sprayed onto the surface of the sample with a spray gun. The impregnated layer is obtained through subsequent heating and curing and high temperature diffusion process.
[0034] The sample solidification process parameters and process of the deposition slurry are the same as in Example 1, the high-temperature diffusion temperature is 950° C., and the time is 2 hours. The process is the same as in Example 1. The scanning electron microscope cross-sectional photos of the obtained coating are as follows: image 3 As shown, the XRD and energy spectrum results show that ...
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