Atmospheric corrosion test procedure and its apparatus

摘要

Provided are an atmospheric corrosion test procedure and an apparatus used for the test. The procedure involves a salt spray step for supplying salt content containing chloride ions on the surfaces of test pieces placed in a thermo-humidistat chamber and a subsequent dry-wet cyclic step including a dry sub-step for drying the surface of the test pieces in the thermo-humidistat chamber at a low relative humidity and a subsequent wet sub-step at a higher relative humidity than that in the dry sub-step, which are cycled. The salt content is supplied by spraying the salt water in the salt spray step. An exhaust step for removing the salt mist sprayed inside thermo-humidistat chamber is further inserted between the salt deposition step and the dry sub-step. The quantity of the salt content deposited on the surfaces of the test pieces is controlled by adjusting the quantity of the sprayed salt water.

主权项

1. An atmospheric corrosion test procedure comprising:
a salt deposition step of supplying salt content containing chloride ions on the surfaces of test pieces placed in a thermo-humidistat chamber; and a subsequent dry-wet cyclic step, the dry-wet cyclic step including a dry sub-step of drying the surfaces of the test pieces in the thermo-humidistat chamber at a low relative humidity and a subsequent wet sub-step, in which the relative humidity in the thermo-humidistat chamber is set to higher value than that in the dry sub-step, the sub-steps being cycled, and wherein the salt content is supplied by spraying salt water in the salt spray step, a first dry sub-step of repeated dry sub-steps is carried out between the salt deposition step and the first wet sub-step of the repeated wet sub-steps, an exhaust sub-step of removing the salt mist sprayed inside the thermo-humidistat chamber is carried out between the salt deposition step and the first dry sub-step, and the quantity of the deposited salt content is controlled by adjusting the quantity of the sprayed salt water.