As an important connector application performance, is the local pressure on microstructure of corrosion. Can be described as a corrosive environment of external pressures and high elasticity, leading to cracks and finally fail. There is an external source of this pressure, produced in connection with combined with process, as well as internal sources (such as from keep the residual stresses in forming and bending of the leader lines. ) Partial failure mode when it appeared on the surface to be aware of, and there is no significant plastic deformation. The crack path in between the particles (interaction), and cracks can be spread through the grain. This crack can be spread through the alloy and medium spread.
Stress corrosion to occur, there must be the following three conditions exist:
1. the influence of alloy must be susceptible to stress corrosion.
2. the working environment makes this particular alloy susceptible.
3. the presence of tensile force.
Related alloy used for this connector acceptability as summary chart 4.6. This index is used to consolidate their performance in different environments of classification. The working environment of lighter medium-range of industrial environmental conditions of navigation, as well as the worst ammonia exposure to damp conditions. Index of this linear distribution from 0 to 1000.
Most susceptible to protection of metals include zinc, C260 contains 30% of zinc is the most vulnerable protected. Its role is limited in order to achieve a healthy environment. Containing 15% zinc C230 only, and contain lower zinc nickel and attach only (C770), which can significantly increase the pressure on the corrosion resistance of low capacity. Tin-bronze, beryllium-copper alloys are nickel-silicon and has good corrosion resistance of copper alloys. Copper-nickel alloy and copper alloy on chemical invasion will have a significant protective effect of crack.