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Method for compositely plating Ni/CrAl/Y2O3 gradient plated layer on T91 steel surface

A surface composite and composite electroplating technology, applied in coatings, electrolytic coatings, etc., can solve the problems of increasing the high temperature oxidation resistance of the coating, difficult Cr and Al ratio, low production efficiency, etc., and achieves easy industrial production, low cost, and operation. simple effect

Inactive Publication Date: 2013-10-09
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention overcomes the shortcomings of traditional physical vapor deposition (PVD) equipment complex, high vacuum requirements, and low production efficiency, and at the same time overcomes the problems caused by the density of Cr powder and Al powder in the process of preparing Ni / CrAl coatings from conventional nickel-plated composite Cr powder and Al. The difference is too large, and it is difficult to control the ratio of Cr and Al. By controlling the process parameters, a gradient coating with a stable Cr / Al mass ratio can be obtained. At the same time, the introduction of an appropriate amount of rare earth can significantly increase the high temperature oxidation resistance of the coating.

Method used

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  • Method for compositely plating Ni/CrAl/Y2O3 gradient plated layer on T91 steel surface
  • Method for compositely plating Ni/CrAl/Y2O3 gradient plated layer on T91 steel surface
  • Method for compositely plating Ni/CrAl/Y2O3 gradient plated layer on T91 steel surface

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Experimental program
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Effect test

Embodiment 1

[0026] 1. CrAl / Y 2 o 3 Powder: 100 grams of spherical CrAl powder with an average particle size of 500nm is added with Y with an average particle size of 20nm 2 o 3 Carry out ball milling after powder 0.3 gram, pass into argon gas in the ball milling tank, seal, and the ball mill rotating speed gets 720 revs / min, every 0.5 hour positive and negative direction alternately grinds, and the ball milling time is 16 hours. The mass percentages of Cr and Al in the CrAl powder used therein are 40% and 60% respectively.

[0027] 2. Degreasing of T91 steel: Use a mixed solution of sodium hydroxide 5g / L, sodium silicate 7g / L, sodium phosphate 3g / L and OP emulsifier 3g / L to degrease T91 steel at a temperature of 50-60°C , time 1 minute, tap water for 1 minute, deionized water for 0.5 minutes, alcohol and acetone mixture for 1 minute, and dry with cold air.

[0028] 3. Acid etching of T91 steel: Use a mixture of hydrochloric acid with a mass fraction of 3% and nitric acid with a mass f...

Embodiment 2

[0033] The experimental material is T91 steel substrate

[0034] 1, 100 grams of average particle diameter is that 800nm ​​spherical CrAl alloy powder is added the Y that average particle diameter is 50nm 2 o 3 After 0.5 grams of powder, argon gas is passed into the ball milling tank, sealed, and high-energy ball milling is carried out. The ball mill speed is 800 rpm, and the positive and negative directions are alternately ground every 0.5 hours. The ball milling time is 30 hours to prepare CrAl / Y 2 o 3 pink. The mass percentages of Cr and Al in CrAl are 40% and 60% respectively, and the particles are spherical.

[0035] 2. Degreasing of T91 steel: Use a mixed solution of sodium hydroxide 5g / L, sodium silicate 7g / L, sodium phosphate 3g / L and OP emulsifier 3g / L to degrease T91 steel at a temperature of 50-60°C , time 1 minute, wash with tap water, wash with deionized water, wash with alcohol and acetone mixture for 1 minute, and dry with cold air.

[0036] 3. Acid etching...

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Abstract

The invention relates to a method for compositely plating Ni / CrAl / Y2O3 gradient plated layer on a T91 steel surface. The method comprises the steps of preparing CrAl / Y2O3 powder, carrying out T91 steel surface treatment and compositely plating. CrAl / Y2O3 micro nano spherical powder is obtained by controlling a high-speed milling process; an appropriate amount of CrAl / Y2O3 micro nano powder is added into a Watts plating liquid, and the Ni / CrAl / Y2O3 gradient plated layer which has excellent corrosion resistance and oxidation resistance is prepared through composite plating. The Ni / CrAl / Y2O3 gradient plated layer provided by the invention is good in bonding force with a base material, low in porosity, free of crack and unlikely to peel off, the CrAl / Y2O3 content of the plated layer from the inner layer to the outer layer changes in a linear gradient manner, and the plated layer has excellent corrosion resistance and oxidation resistance, and has the advantages of low cost and simplicity in operation and industrialization is easy to realize.

Description

technical field [0001] The invention relates to a composite electroplating Ni / CrAl / Y on the surface of T91 steel 2 o 3 A gradient coating method belongs to the technical field of metal surface treatment and corrosion protection. Background technique [0002] NiCrAlY not only has good high temperature resistance, but also has good toughness, and is used in engine blades. At present, there are still many researches and applications on NiCrAlY coating at home and abroad. Because the MCrA1Y high-temperature coating has good toughness, good thermal corrosion resistance, oxidation resistance, and thermomechanical fatigue resistance, but its composition is often different when used on the surface of different substrates, and new materials and deposition processes are constantly emerging. Probe into suitable preparation Technology is one of the current research hotspots. [0003] The phases of MCrA1Y coatings are usually multiple. For example, when the concentration of aluminu...

Claims

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Application Information

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IPC IPC(8): C25D15/00C25D5/08C25D5/12
Inventor 刘光明王彩福刘德强于斐田继红
Owner NANCHANG HANGKONG UNIVERSITY
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