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Three new surface treatment processes for the properties and properties of titanium
May 23, 2016

Titanium has high specific strength, good corrosion resistance and resistance temperature (more than 1 650 DEG C melting point), and a + 2, + 3, + 4 valence oxidation state, exist in a state of ion in the solution, so you can use titanium of the properties and characteristics of surface treatment. Three new processes were obtained in the study of surface treatment process using titanium by researchers of Osaka Prefecture University in Japan.、

(1) by chemical method, the high purity nickel coating was prepared by oxidation reduction ion pair Ti3+/Ti4+.

(2) preparation of metal nanoparticle coatings by redox ions on TiN/TiF62-.

(3) carbon films were coated on the surface of titanium by plasma carburizing, in order to improve the corrosion resistance. The next will be a brief introduction of these three processes.

Process using chemical methods for the preparation of nickel coating requires the use of a variety of reducing agents, if the selection of sodium hypophosphite (NaH2PO2) as a reducing agent, to obtain P content is 10% ~ 12% of the nickel coating, the coating has excellent non magnetic stability, can be used as a hard disk substrate coating materials;

 if the selection of sodium borohydride (NaBH4) as reducing agent, can obtain amorphous high strength nickel plating layer and contains a certain amount of B. To obtain pure nickel plating layer, it is necessary to avoid reducing agent penetrate coating composition, so, using redox ion of Ti3+/Ti4+, namely in the chemical method was used to prepare nickel coating in this process, the three valent titanium and 4 valent titanium exists in the form of ion, and in the plating liquid nitrogen based three acetic acid or citric acid (as a stabilizer), the nickel ion can be added to form a complex. With this method, a pure nickel coating with a thickness of about 10 nm was successfully prepared on the Cu line.

Process two TiN in the fluoride ions in the aqueous solution, TiN in the Ti will dissolve the formation of TiF62-, the reaction occurred as the formula (1) and the formula (2).

TiN+6HF=TiF62-+NH4++2H++e- (pH < 3) (1)

TiN+6F-+4H+=TiF62-+NH4++e- (pH > 3) (2)

Using the reaction of the release of electrons can be reduced than the Ti potential is higher than the Pd2+, so you can TiN on the Pd. The deposition of Pd nanoparticles prepared at different pH values and different temperatures was studied. 

The results show that the particle of Pd coating is the minimum and the dispersion is best when the bath temperature is 70 degrees C and the solution pH is 5.2. The TEM test results showed that the Pd nanoparticles with a particle size of about 50 nm were formed on the TiN. Due to the low conductivity of TiN, the metal can not be plated on the surface of the electrolytic method, and the electrochemical plating method of the TiN/TiF62- by the redox ion is the best choice.

Three magnesium battery as a new generation of two battery, with a long life, no pollution, small size, large capacity and so on, the development of. Typically, magnesium battery electrolyte is Yigeliya reagent for matrix solution and the electrolyte exists high concentration of chloride ion, easy to cause the corrosion of electrode materials. 

Therefore, to make magnesium battery to real commercial applications must to find a kind of low cost and stable performance of the electrode material. To this end, a layer of glass carbon film was deposited on the titanium surface by plasma carburizing treatment (carbon source for methane or propylene), and the corrosion resistance of titanium in electrolyte was improved. Because of its low carbon absorption, glassy carbon film formed on the surface of the thickness of a few microns, with excellent corrosion resistance.