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Pretreatment technology of surface metal plating of titanium alloy and metal plating method

A surface metal and titanium alloy technology, applied in metal material coating process, liquid chemical plating, coating, etc., can solve the problems of notch effect, fatigue strength reduction of titanium alloy, etc., and achieve low pollution, low temperature, and few pores Effect

Active Publication Date: 2011-12-21
京磁材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Titanium alloys are very sensitive to fretting fatigue damage. Although titanium alloys exhibit excellent corrosion resistance in many media, under the action of fretting, the protective film on the surface of titanium alloys will be continuously worn away, resulting in a notch effect. , so that the fatigue strength of titanium alloy is significantly reduced

Method used

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  • Pretreatment technology of surface metal plating of titanium alloy and metal plating method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Prepare the Ni-P metal plating solution according to the formulation requirements of No. 01 plating process in Table 1, and adjust the pH value of the plating solution to 4.8 for later use. The titanium alloy material processed into 15mm × 10mm × 5mm is subjected to pickling, alkali washing, etching, activation and reduction treatment in sequence, and the titanium alloy rinsed with distilled water is immersed in the plating solution with a temperature controlled at 90 ± 2°C. Electroless plating was applied for 2 hours with stirring to make the thickness of the coating reach 15 μm. After taking it out, rinse it with tap water and distilled water in turn, and dry it. Then the obtained Ni-P alloy was sintered in a muffle furnace at 250° C. for 2 hours, and dried naturally to obtain a titanium alloy-plated Ni-P alloy coating.

[0027] The structural composition, surface morphology and cross-sectional structure of the coating were observed by XRD and SEM. The results showed...

Embodiment 2

[0029] Except preparing the Ni-B metal plating solution according to the formula requirement of No. 02 plating process in Table 1, and adjusting the pH value of the plating solution to 12.5, all the other are the same as in Example 1.

[0030] The structural composition, surface morphology and cross-sectional structure of the coating were observed by XRD and SEM. The results showed that the obtained Ni-B alloy coating was amorphous after heat treatment at 250℃×2h, and the crystal plane structure was uniform and complete. The test method of the bonding strength of the coating adopts tensile test, thermal shock test and scratch method, and the results show that under certain conditions, the coating does not peel, evenly crack and fall off. The electrochemical corrosion behavior of Ni-P alloy coating was evaluated by Tafel curve and salt water immersion test. The results show that the coating greatly improves the corrosion resistance of the metal substrate.

Embodiment 3

[0032] The pretreated titanium alloy was first immersed in the prepared Ni-P metal plating solution at 90°C for 30 minutes, and then metal-plated with Ni-B alloy coating at 85°C for 60 minutes to obtain Ni -P / Ni-B composite coating. After taking it out, rinse it with tap water and distilled water in turn, and dry it. Then the obtained Ni-P / Ni-B composite coating was sintered in a muffle furnace at 250°C for 2h, and then dried naturally.

[0033] The surface morphology and cross-sectional morphology of the sample after two platings were observed by SEM, and the results showed that the two coatings were closely bonded, had good compatibility, and had no obvious pores. Tensile test, thermal shock test and scratch method are used to test the combination of coatings. The results show that the coatings are not peeled, evenly cracked and peeled off under certain conditions. The electrochemical corrosion behavior of Ni-P alloy coating was evaluated by Tafel curve and salt water imme...

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Abstract

The invention discloses a pretreatment technology of the surface metal plating oftitanium alloy and a metal plating method adopting the pretreatment technology. The pretreatment technology comprises the following steps: performing alkaline degreasing on the titanium alloy, soaking the titanium alloy in H2C2O4 solution at the temperature of 80 DEG C, performing eroding treatment with ultrasonic wave for 3 hours, activating by use of an efficient ionic palladium activation treatment agent for 1-2 minutes, and performing chemical reduction for 30-60 seconds to perform metal plating. The metal plating method comprises the following steps: placing the pretreated titanium alloy in an acidic solution at the temperature of 80-90 DEG C to perform metal plating for 2-3 hours, taking the alloy out, rinsing to obtain Ni-P, Ni-B and Ni-P / Ni-B alloy platings, and drying at 250-350 DEG C for 30-45 minutes to obtain the finished product. The metal plating pretreatment technology of the titanium alloyhas the advantages that the process is simple, the method is environmentally-friendly and fluorine-free, the treatment liquid can be used repeatedly and circularly, and the like.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy surface treatment, and relates to a pretreatment process for metal plating on the surface of titanium alloy and a specific method for plating an alloy coating. Background technique [0002] Titanium and titanium alloys have high specific strength, excellent corrosion resistance, good high temperature performance, etc., and are a new structural and functional material in the 1950s. At present, titanium alloy is mainly used in aerospace and military industries, and has become the main material for manufacturing high-performance aero-engine fans, compressor discs, blades and other important components, and is known as "space metal". [0003] Fretting damage is one of the important failure forms of mechanical parts. Fretting damage is a typical composite wear form combined with mechanical and chemical effects, which is manifested as surface adhesion, wear, corrosion, and mixed with clusters tha...

Claims

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Application Information

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IPC IPC(8): C23C18/18C23C18/32C23C18/50
Inventor 邵忠财姜海涛邵颖孙亮
Owner 京磁材料科技股份有限公司
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