Silver uniform corrosion

The most common form of corrosion is uniform corrosion, in which the entire metal surface degrades at a near uniform rate (1 3). Often the surface is covered by the corrosion products. The msting of iron (qv) in a humid atmosphere or the tarnishing of copper (qv) or silver alloys in sulfur-containing environments are examples (see also SiLVERAND SILVER ALLOYS). High temperature, or dry, oxidation, is also usually uniform in character. Uniform corrosion, the most visible form of corrosion, is the least insidious because the weight lost by metal dissolution can be monitored and predicted. 

Dissolution of steel or zinc in sulfuric or hydrochloric acid is a typical example of uniform electrochemical attack. Steel and copper alloys are more vulnerable to general corrosion than other alloys. Uniform corrosion often results from atmospheric exposure (polluted industrial environments) exposure in fresh, brackish, and salt waters or exposure in soils and chemicals. The rusting of steel, the green patina on copper, tarnishing silver and white mst on zinc on atmospheric exposure are due to uniform corrosion.14... 

Metals that are easily but uniformly corroded, such as silver and copper and their alloys. Some of the corrosion products of these metals and alloys are somewhat stable and serve as protective layers that protect the underlying metal from further corrosion. 

A supporting conductive structure, made of a nickel-wire woven net, silver-plated in order to minimise corrosion of the substrate arising from the operating conditions, and able to distribute the current uniformly all over the surface. 

General Corrosion, or Uniform Attack. This type of corrosion includes the commonly recognized rusting of iron or tarnishing of silver. Fogging of nickel and high-temperature oxidation of metals are also examples of this type. 

In the manufacture of the M2-2 the contractors used the latest techniques to insure uniformity and quality. All silver brazing on the gun assembly was done by induction heating and die cast aluminum parts were used for lightness and interchangeability. Corrosion resistant materials were used to withstand the effects of extreme climatic conditions. Complications arose in the manufacture of the fuel valve, the safety mechanism, and the outlet valve needle. The technique for the construction of the fuel valve, which consisted of a rubber diaphragm molded to a metal pin, was never fully developed, and on several occasions the service had to suspend production because of the number of rejects of this valve. The safety mechanism had two objectionable features it frequently pinched the operator s hand and it had a tendency to shift to the "off safety ... 

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