Method for preparing zinc phosphate conversion coating on surface of titanium

A technology of zinc phosphate and conversion coating, which is applied in the field of biomedical metal materials to achieve the effects of high crystallinity, excellent surface structure and mechanical properties, and excellent electrochemical properties

Inactive Publication Date: 2014-07-30
SUZHOU RES INST SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the research on the chemical transformation of zinc phosphate on

Method used

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  • Method for preparing zinc phosphate conversion coating on surface of titanium
  • Method for preparing zinc phosphate conversion coating on surface of titanium

Examples

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Embodiment 1

[0022] A method for preparing a zinc phosphate conversion coating on a titanium surface is provided, comprising the steps of:

[0023] (1) First, pour 1 / 3 volume of water into the acid-resistant beaker, and add H at one time 3 PO 4 , then pour the powdered ZnO slowly, stir for 10~20min to fully react, then add Zn(NO 3 ) 2 ·6H 2 O and Ca(NO 3 ) 2 4H 2 O. The contents of the basic chemical raw materials used are H 3 PO 4 : 30g / L, ZnO: 9g / L, Zn(NO 3 ) 2 ·6H 2 O: 23g / L, Ca(NO 3 ) 2 4H 2 O: 23g / L, keep the molar ratio Zn:P:Ca=0.6:1:0.3, and finally add different types of accelerators 3 g / L. After stirring for a sufficient time, add H 3 PO 4 and ZnO to adjust the pH to 2.6.

[0024] (2) Immerse the polished pure titanium sample in an alkaline degreasing solution (NaOH: 15g, NaOH: 15g, Na 2 CO 3 :30g, Na 3 PO 4 : 70g, Na 2 SiO 3 : 10 g) for 20 min, and rinse thoroughly with tap water and deionized water respectively. Put the rinsed sample into 2% HF solution ...

Embodiment 2

[0028] A method for preparing a zinc phosphate conversion coating on a titanium surface is provided, comprising the steps of:

[0029] 30g / L H 3 PO 4 , 9g / L ZnO, 23g / L Zn(NO 3 ) 2 ·6H 2 O, 23g / L Ca(NO 3 ) 2 4H 2 Mix O and 3g / L accelerator, stir well, add H 3 PO 4 and ZnO to adjust the pH value to 2.6, and prepare a chemical conversion basic solution; add a current field to the chemical conversion basic solution, use an inert electrode Pt as the anode, and use 2% HF to activate pure Ti after surface adjustment of colloidal titanium phosphate as the cathode. The current density used was 40 mA / cm 2, the temperature is 60° C., and the reaction treatment time is 30 minutes.

Embodiment 3

[0031] A method for preparing a zinc phosphate conversion coating on a titanium surface is provided, comprising the steps of:

[0032] 40g / L H 3 PO 4 , 12g / L ZnO, 30g / L Zn(NO 3 ) 2 ·6H 2 O, 30g / L Ca(NO 3 ) 2 4H 2 Mix O and 4g / L accelerator, stir well, add H 3 PO 4 and ZnO to adjust the pH value to 2.6, and prepare a chemical conversion basic solution; add a current field to the chemical conversion basic solution, use an inert electrode Pt as the anode, and use 2% HF to activate pure Ti after surface adjustment of colloidal titanium phosphate as the cathode. The current density used was 20 mA / cm 2 , the temperature is 60° C., and the reaction treatment time is 30 minutes.

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Abstract

The invention discloses a method for preparing a zinc phosphate conversion coating on the surface of titanium. The method comprises the following steps: mixing a phosphorous compound, a zinc-containing compound, a calcium-containing compound and an accelerant together to form a chemical conversion basic liquid; performing activating treatment and surface adjustment on a pure titanium substrate; putting the treated pure titanium substrate in the chemical conversion basic liquid and applying an electric current field, wherein the pure titanium substrate is taken as a cathode, while platinum is taken as an anode; and obtaining the zinc phosphate conversion coating on the surface of titanium after chemical conversion. In such a manner, the reaction of the method for preparing the zinc phosphate conversion coating on the surface of titanium can be finished at a relatively low temperature, and the obtained product is high in degree of crystallinity and good in electrochemical performance; the method is low in pollution, low in cost and simple in process, and thus suitable for large-scale production and application; the zinc phosphate conversion coatings more excellent in mechanical properties can be obtained by use of the methods of solution optimization, current intensity change, time control and the like.

Description

technical field [0001] The invention relates to the field of biomedical metal materials, in particular to a method for preparing a zinc phosphate conversion film on a titanium surface. Background technique [0002] Zinc phosphate tetrahydrate (Zn 3 (PO4) 2 4H 2 O) Because of its good corrosion resistance and protection, it is widely used in the anticorrosion of metal surfaces, improving the adhesion of coatings and surface lubrication. Recently, zinc phosphate tetrahydrate has been found to have good biocompatibility and can be converted into hydroxyapatite (HA) under certain conditions, which can be used as a potential biomedical material. Titanium is widely used in defense, aerospace, shipbuilding and other industrial fields due to its light weight, high strength and good corrosion resistance. At the same time, due to the similar elastic modulus and good biocompatibility of titanium and bone, it has also been widely used in clinical practice. The preparation of a laye...

Claims

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Application Information

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IPC IPC(8): C25D11/36
Inventor 吕宇鹏赵性川肖桂勇张娴
Owner SUZHOU RES INST SHANDONG UNIV
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