Search results
Results from the WOW.Com Content Network
Pourbaix diagram of iron. [1] The Y axis corresponds to voltage potential. In electrochemistry, and more generally in solution chemistry, a Pourbaix diagram, also known as a potential/pH diagram, E H –pH diagram or a pE/pH diagram, is a plot of possible thermodynamically stable phases (i.e., at chemical equilibrium) of an aqueous electrochemical system.
Pourbaix diagram for titanium in pure water, perchloric acid, or sodium hydroxide [26] Like aluminium and magnesium , the surface of titanium metal and its alloys oxidize immediately upon exposure to air to form a thin non-porous passivation layer that protects the bulk metal from further oxidation or corrosion. [ 11 ]
The simplified entries in the reaction column can be read in detail from the Pourbaix diagrams of the considered element in water. Noble metals have large positive potentials; [24] elements not in this table have a negative standard potential or are not metals.
The Pourbaix diagram for vanadium in water, which shows the redox potentials between various vanadium species in different oxidation states. [43] Vanadium(V) forms various peroxo complexes, most notably in the active site of the vanadium-containing bromoperoxidase enzymes. The species VO(O) 2 (H 2 O) 4 + is stable in acidic solutions.
The Pourbaix diagram for vanadium in water, ... Vanadium foil is used in cladding titanium to steel because it is compatible with both iron and titanium. [92]
You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.
According to the Pourbaix diagram for iron, the metal is passive when the pH is above 9.5. [1] The carbon dioxide in the air reacts with the alkali in the cement and makes the pore water more acidic, thus lowering the pH. Carbon dioxide will start to carbonatate the cement in the concrete from the moment the object is made.
You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.