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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  • 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 a

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

Examples

Experimental program
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Example Embodiment

[0025] Example 1

[0026] 1. CrAl / Y 2 O 3 Powder: 100 grams of spherical CrAl powder with an average particle size of 500 nm is added with Y with an average particle size of 20 nm 2 O 3 After 0.3 grams of powder, the ball mill is carried out. Argon gas is introduced into the ball mill tank and sealed. The speed of the ball mill is set at 720 rpm, and the grinding time is 16 hours. The mass percentages of Cr and Al in the CrAl powder used are 40% and 60% respectively.

[0027] 2. T91 steel degreasing: use a mixed solution of sodium hydroxide 5g / L, sodium silicate 7g / L, sodium phosphate 3g / L and OP emulsifier 3g / L for degreasing treatment on T91 steel at a temperature of 50-60℃ , Time is 1 minute, tap water for 1 minute, deionized water for 0.5 minutes, alcohol and acetone mixture for 1 minute, and cool air to dry.

[0028] 3. Acid etching of T91 steel: Use a mixture of 3% hydrochloric acid and 3% nitric acid to perform acid etching treatment on the surface of T91 steel. The temperat...

Example Embodiment

[0032] Example 2

[0033] The experimental material is T91 steel substrate

[0034] 1. 100 grams of spherical CrAl alloy powder with an average particle size of 800 nm is added with Y with an average particle size of 50 nm 2 O 3 After 0.5 grams of powder, argon gas is passed into the ball mill tank, sealed, and high-energy ball milling is performed. The speed of the ball mill is 800 rpm, and the milling is alternately in both positive and negative directions every 0.5 hour. The milling time is 30 hours to prepare CrAl / Y. 2 O 3 powder. Among them, the mass percentages of Cr and Al in CrAl are 40% and 60% respectively, and the particles are spherical.

[0035] 2. T91 steel degreasing: use a mixed solution of sodium hydroxide 5g / L, sodium silicate 7g / L, sodium phosphate 3g / L and OP emulsifier 3g / L for degreasing treatment on T91 steel at a temperature of 50-60℃ , Time 1 minute, wash with tap water, deionized water, wash with alcohol and acetone mixture for 1 minute, dry with cold air...

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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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