uniform corrosion

uniform corrosion

[′yü·nə‚fȯrm kə′rō·zhən]
(metallurgy)
Corrosion which takes place uniformly over the entire exposed surfaces.
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Uniform corrosion usually results in the greatest loss of metals.
They cover the thermodynamics of materials corrosion, electrochemical corrosion kinetics, oxidation and hot corrosion of metals and alloys, the uniform corrosion and passivation in metallic materials, localized corrosion in metallic materials, stress corrosion in the cracking of metals, the corrosion and protection of metal in the natural environment and chemical medium, the corrosion and protection of nonmetal material, the corrosion of materials in high-technology fields, and the protection technology of material corrosion.
In general a distinction is drawn between general or uniform corrosion and localized corrosion like pitting and crevice corrosion.
[23] reported the equation of the elastic modulus of corroded reinforcement by a large of experimental programs which considered the influence of the elastic modulus of the uniform and the pit corrosion, for uniform corrosion, [E.sub.sd] = (1 - 0.75p/100)[E.sub.s], but for pit corrosion, [E.sub.sd] = (1 - 1.13p/100)[E.sub.s], where [E.sub.s] and [E.sub.sd] are the elastic modulus of noncorroded and corroded reinforcement and p is the corrosion level of the steel reinforcement which was determined using the mass loss analysis described.
Buchheit, "Dependence on temperature, pH, and Cl- in the uniform corrosion of aluminum alloys 2024-T3, 6061-T6, and 7075-T6," International Journal of Corrosion, vol.
There are two main forms of rebar corrosion [35-37]: (1) uniform corrosion and (2) pit corrosion.
The three components CaHPO4-2H2O, Ca3 (PO4)2, and MnHPO4 x 3H2O were homogenized in the coating, which may cause the change of corrosion mechanism from local corrosion to uniform corrosion. This indicates that the lumpy-crystal manganese compound offered a most improved corrosion protection for the Mg alloy.
From the change in voltage drop readings and distribution, uniform corrosion can be established and localized corrosion can be tracked by pin location.
In all cases, PF values move from the region of generalized corrosion with pitting attack to the region of uniform corrosion. This is expected because the FeC[O.sub.3] precipitation onto steel surface gives it some protection, and this precipitation is favored by increasing the temperature.
With SFC, uniform corrosion was reproduced, associated to a marine atmosphere in which corrosion factors, like temperatures of 35 [degrees], relative humidity at 100%, saline fog, and alternate humidification and drying cycles.
The analysis of three corrosion phenomena (uniform corrosion, pitting corrosion and stress corrosion cracking) has been carried out through the use of acoustic emission technique.
Low concentration of zirconyl nitrate leads to improve barrier properties and uniform corrosion protection.

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