抄録
The large majority of condenser tubes in use at the present time is manufactured of copperbase alloy, primarily because these materials exhibit excellent corrosion resistant properties under the various conditions of service to which they are exposed. The high thermal conductivity and favorable physical properties of copper alloy are also of importance in this application.
Many cases of tube corrosion are experienced when an electrochemical action, generally termed concentration cell corrosion is set up. Corrosion of this type usually results in intense local pitting of the tube surface.
Especially, deposit is a form of concentration cell action initiated by lodgement of sand, mud, cinders, stones, wood, shells, iron scale, etc., on the tube surface. Intense pitting of the tube wall may take place at or adjacent to such deposits.
When the deposits is fixed on the tube wall, however, there seems to be a little detrimental effect produced by deposits, if not the cooling water flow is high speed.
This paper report on the phenomena, which is violent attack on the occasion of happening the deposits vibrate on the tube walls. The attack of this type is named the vibration deposit attack. This paper presents the results on the vibration deposit attack test, and the effect of the polluted cooling water, usually the sea water take into service.
