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Preparation method of high-strength seawater corrosion resistant wear composite coating

A composite coating, corrosion and wear technology, applied in the direction of coating, metal material coating process, melt spraying, etc., can solve the problems of reliability, safety and service life of mechanical parts, achieve excellent comprehensive performance, improve The effect of bond strength

Inactive Publication Date: 2019-01-29
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the seawater environment, the synergistic effect of corrosion and wear will greatly reduce the reliability, safety and service life of mechanical components of marine equipment

Method used

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  • Preparation method of high-strength seawater corrosion resistant wear composite coating
  • Preparation method of high-strength seawater corrosion resistant wear composite coating
  • Preparation method of high-strength seawater corrosion resistant wear composite coating

Examples

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preparation example Construction

[0032] The invention discloses a method for preparing a high-strength seawater corrosion-resistant and wear-resistant composite coating. By adding metal element Mo, the microhardness of the coating can be effectively improved, the friction coefficient and wear rate of the coating in seawater environment can be reduced, and the wear resistance of the coating can be significantly improved. Tribological performance, the composite coating exhibits excellent comprehensive performance; the specific steps are as follows:

[0033] S1, mixed powder

[0034] In terms of mass fraction, NiCrAlY is 85-95%, Mo is 5-15%, and the weighed powder is mixed evenly on a three-dimensional powder mixer;

[0035] S2. Surface grinding treatment of base sample

[0036] Grind the cut substrate sample on coarse sandpaper to remove oil stains on the surface of the substrate sample;

[0037] S3. Sand blasting treatment on the surface of the sample

[0038] Before spraying, sand blast the surface of the ...

Embodiment 1

[0045] The spraying tests were carried out using the laboratory's SulZer Metco 9M plasma spraying apparatus. First, the uniformly mixed spray powder is dried in a vacuum drying oven to ensure smooth powder feeding during the spraying process, and then the base material is sandblasted and cleaned to remove residual oil stains and sand on the base surface. Before spraying, the substrate material should be preheated to reduce the temperature difference between the molten particles and the substrate surface, so that it can better adhere to the substrate surface, thereby improving the bonding strength of the coating. After the substrate sample is preheated to 300 At ~500°C, carry out the spraying test. The spraying parameters during the test are Ar flow rate 38-45L / min, H 2 The flow rate is 4.5-6L / min, the spraying angle is 80-100°, the powder feeding rate is 40-45g / min, the current is 500-550A, the voltage is 50-60V, and the spraying distance is 100-110mm. The composite coating ...

Embodiment 2

[0047] The coating prepared in Example 1 was cut into a corrosion wear test sample, the sample size was 20mm × 20mm × 1.5mm, the corrosion solution was artificial seawater, and the artificial seawater was proportioned according to the ASTMD114-98 standard, with 0.1M NaOH solution Adjust the pH value of the artificial seawater to 8.2. Before the test, the sample was soaked in the solution tank for 0.5 hours, and then the corrosion and wear test was carried out on the corrosion and wear testing machine. The friction speed is 0.8mm / s, the force is 5N, the reciprocating friction test range is 3.5mm, and the friction test is 1 hour. It is measured that after adding the metal element Mo, the friction coefficient of the coating is reduced from 0.36 to 0.25, and the wear rate is reduced from 4.6×10 -5 mm 3 / N.m reduced to 3.9×10 -5 mm 3 / N.m, the corrosion resistance and wear resistance are significantly enhanced, such as Figure 4 shown.

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Abstract

The invention discloses a preparation method of a high-strength seawater corrosion resistant wear composite coating. The preparation method comprises the following steps that firstly, sand blasting and cleaning treatment on a substrate sample is carried out; secondly, preheating treatment on the substrate sample is carried out; and finally a NiCrAlY-Mo coating is prepared on the surface of the substrate by adopting a plasma spraying technology, a layer of NiAl bonding layer is sprayed between the coating and the substrate; and the combination between the bonding layer and the coating is good;after the metal element Mo is added, the microhardness of the coating is increased to 342.5HV from 329.8HV, the friction coefficient in the seawater environment is reduced from 0.36 to 0.25, the abrasion rate is 4.6*10<-5>mm<3> / N. m is reduced to 3.9*10*<-5> mm<3>N. m. The coating has excellent comprehensive performance.

Description

technical field [0001] The invention belongs to the technical field of coating materials, and in particular relates to a preparation method of a high-strength seawater corrosion-resistant and wear-resistant composite coating. Background technique [0002] In recent years, with the increasing consumption of terrestrial resources, the research and utilization of marine resources have been increasing. Therefore, the comprehensive performance of marine equipment such as ships, oil collection platforms, and offshore wind turbines needs to be continuously improved to meet the continuous development of marine engineering. Especially for the friction parts of marine equipment, they are directly in contact with seawater, and have serious corrosion and wear at the same time. The synergy between corrosion and wear is very complex, involving interactions between physics, mechanics, chemistry, and electrochemistry. In the process of corrosion and wear, the protective passivation film o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/073C23C4/02
CPCC23C4/02C23C4/073C23C4/134
Inventor 李博高义民李聪郑巧玲李烨飞刘志伟郑开宏王娟
Owner XI AN JIAOTONG UNIV
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