Chemical properties of titanium rod and titanium electrode _ oxidation
Original Title Chemical Properties of titanium tubing price Titanium Rod and Titanium Electrode Chemical Properties of Titanium Rod and Titanium Electrode Titanium is a very corrosion-resistant metal The thermodynamic data of titanium show that titanium is a very thermodynamically unstable metal If titanium can be dissolved to form Ti2 + its standard electrode potential is very negative (-163 V) and its surface is always covered with a passive oxide film In this way the stable potential of titanium is stably biased to a positive value for example the stable titanium round bar potential of titanium in seawater at 25d egree C is about + 009 V Standard electrode potentials corresponding to a series of titanium electrode reactions are available in chemistry handbooks and textbooks It is worth pointing out that in fact these data are not directly measured but often can only be calculated from thermodynamic data and because of the different sources of data it is not surprising that there are different data for several different electrode reactions that may be expressed at the same time
The electrode potential data of the electrode reaction of titanium show that the surface of titanium is very active and is usually covered with an oxide bra tape measure film formed naturally in air Therefore the excellent corrosion resistance of titanium is due to the fact that there is always a layer of stable adhesive and protective oxide film on the surface of titanium In fact the stability of this natural oxide film determines the corrosion resistance of titanium including titanium rods titanium wires and titanium plates of titanium and titanium alloys Of course the corrosion resistance of various brands is different We have talked about it in the previous content of the website so nickel titanium wire I will not say more today In theory the P/B ratio of the protective oxide film must be greater than 1 If it is less than 1 the oxide film can not completely cover the metal surface so it is impossible to play a protective role If this ratio is too large the compressive stress in the oxide film will increase accordingly which will easily cause the rupture of the oxide film and will not play a protective role The P/B ratio of titanium varies with the composition and structure of the oxide film ranging from 1 to 2 titanium filler rod 5 From this basic point of view the oxide film of titanium can have better protection performance When the titanium surface is exposed to the atmosphere or aqueous solution a new oxide film will be automatically formed immediately For example the thickness of the oxide film in the atmosphere at room temperature is 12 ~ 16 nm and it increases with time After 70 days it naturally increases to 5 nm and after 545 days it gradually increases to 8 ~ 9 nm Artificially enhanced oxidation conditions (such as heating using an oxidant or anodizing etc)
