Precautions for processing and use of titanium anode plate

I. Base material: titanium

Titanium is a metal element, gray, atomic number 22, relative atomic mass 47.867, can be burned in nitrogen, high melting point. Dull titanium and titanium-based alloys are new structural materials, mainly used in the aerospace industry and sailing industry. Because titanium has a high melting point, small specific gravity, high specific strength, good resistance, acid and alkali corrosion resistance, low thermal conductivity, good concave and convex temperature tolerance function, in the rapid cold and heat conditions of the stress is small, etc., the commercial value of its in the 1950s began to be known to the people, is used in aviation, aerospace and other high-tech areas. Followed by the continuous to the chemical industry, petroleum, electric power, desalination, construction, daily necessities and other professions, titanium metal is increasingly being focused on, known as the modern metal, metal of wisdom, strategic metals, is the progress of national defense equipment level can not be indispensable to the important strategic materials.

1, physical properties, pure titanium metal is silver-white. Compared with other metal materials, titanium features the following:

① melting point of up to 1660 degrees.

② titanium at room temperature (below 885 degrees) is a dense row of hexagonal lattice, and at higher than 885 degrees is a body-centered cubic lattice, with a volume of 5.5%.

③ titanium density of about 4.51g/cm3, is about 60% of stainless steel, beyond the aluminum, about 60% larger than aluminum.

④ Although the tensile strength of pure titanium is 350-700mpa, but the general titanium alloy can reach 700-1200mpa, or up to 1400mpa. thus, the specific strength of titanium alloy (i.e., the ratio of the strength to the density), than any other materials are now large.

⑤ The specific heat, thermal conductivity and electrical resistivity of titanium are at the same level with stainless steel, but the coefficient of expansion of titanium is 50% smaller than that of steel. Titanium's thermal conductivity is poorer, and the electrical conductivity function is also poorer, approximate to stainless steel.

⑥ titanium Young's modulus is smaller than stainless steel, it can be bent under lower stress.

⑦ in the 200 ~ 300 temperature range to comply with the stable creep characteristics.

2、Chemical properties

① and acid action at room temperature, titanium is not easy to also inorganic acid reaction, but after heating to the reaction.

② and alkali titanium and general alkali solution reacts slowly, and dilute alkali solution does not react.

③ and non-metallic role in general, titanium is not very active, but at high temperatures, titanium can be directly with many non-metallic elements to generate a very stable, very hard and insoluble gap-filling compounds.

④ absorbent titanium is an important characteristic is able to absorb gases (oxygen, nitrogen, hydrogen). Titanium and oxygen, nitrogen role is not reversible, so titanium is an outstanding gas absorber. Titanium absorbed in a vacuum heated to 800 ~ 900 degrees can be discharged from the metal.

3, mechanical processing function of titanium strength and density ratio is higher than iron and aluminum. Its strength is 1 times greater than pure iron, 5 times higher than pure aluminum.

II. titanium anode full name called titanium base metal oxide coating titanium anode (mmo). Also called dsa anode (scale shape stabilized anode). It takes titanium as the substrate and brushes the precious metal coating on the titanium substrate, which makes it have outstanding electrocatalytic and conductive properties.

Compared with the original graphite anode and lead anode, titanium electrode has the following advantages:

1, electrode scale is more stable, the electrolysis process will not change the interval between the electrodes, to ensure that the electrolysis operation is carried out in the case of stable tank voltage;

2, catalytic, low operating voltage;

3, Low operating voltage, thus less power consumption, DC power consumption can be reduced by 10% --- 20%;

4, long operating life of titanium anode, compartmentalization method in the production industry, metal anode chlorine and alkali corrosion resistance, the life of the anode has reached more than 5 ~ 7, and graphite anode is only 8 months;

5, It can overcome the dissolution problem of graphite anode and lead anode, and prevent the pollution of electrolyte and cathode products, thus greatly improving the purity of metal products;

6, It can improve the density of current and increase the electrolysis power;

7, precious metal iridium and ruthenium oxides, thus titanium electrode corrosion resistance is stronger;

8, can prevent the short-circuit problem after the lead anode deformation, and then can progress the power of the current;

9, titanium electrode is light weight, compared with graphite anode and lead anode can reduce labor intensity;

10, titanium substrate shape and production is relatively simple, can be high-precision;

11, under the premise of undamaged, the substrate can be repeated trial;

Titanium anode classification:

1, according to the anode in the electrochemical reaction to distinguish between the gas, divided out of the so-called precipitation of chlorine anode, such as ruthenium system coated titanium electrode: divided out of the oxidation of the so-called precipitation of oxygen anode, such as iridium system coated titanium electrodes and platinum titanium mesh / plate. Chlorination anode (ruthenium coated titanium electrode): the electrolyte has high chlorine ion content, generally in the environment and electrolysis of seawater, electrolysis of salt water environment. The corresponding products of our company are ruthenium-iridium titanium anode and ruthenium-iridium tin titanium anode.

2, Oxygen precipitation anode (iridium coated titanium electrode): the electrolyte is generally sulfuric acid environment. Corresponding to our products are iridium-tantalum anode, iridium-tantalum tin titanium anode, high iridium titanium anode.

3, Platinum coated anode: titanium is the base material. Surface coated with platinum, coating thickness is generally 0.5-5μm, platinum titanium mesh mesh specifications are generally 12.5 × 4.5mm or 6 × 3.5mm.

III. Introduction to the production process

1, select ta1 grade titanium substrate, determine the substrate surface is smooth and flat, no scratches, peeling, cracking, delamination and other shortcomings.

2, the purchase of titanium substrate for mechanical processing, processing for the customer's specifications required by the scale.

3, 600 ℃ temperature of the titanium substrate annealing leveling treatment.

4, annealing and leveling treatment of titanium substrate surface will constitute a fine layer of titanium oxide, mechanical methods to polish it, so that the surface is titanium metal luster.

5, with 10% concentration of oxalic acid on the titanium substrate pickling corrosion, in the state of micro-boiling for 10 hours, so that the surface of the oxidized layer of etching for the surface.

6, According to the customer's use of anode environment for a reasonable qualitative and quantitative equipment of precious metal solutions.

7, Testing the pickled titanium substrate qualified, that is, the surface layer is gray uniform sisal structure, and then manually coated, according to set the appropriate temperature for sintering, sintering out of the cooling, cooling to room temperature for the second coated, and so on, until 18~22 times more than the equipment will be equipped with the solution coated.

8, After the sintering of the above processed parts is finished, the test piece will be tested with the furnace for the life test, and it will be packed and shipped if it passes the test.