Chemical apparatus and process disinfecting – deodorizing – preser – Process disinfecting – preserving – deodorizing – or sterilizing – Process control in response to analysis
Patent
1989-05-01
1990-08-21
Hruskoci, Peter
Chemical apparatus and process disinfecting, deodorizing, preser
Process disinfecting, preserving, deodorizing, or sterilizing
Process control in response to analysis
422 13, 210696, 210746, 210752, C23F 1106
Patent
active
049504533
ABSTRACT:
There is disclosed a method for the protection of metal surfaces against corrosion by the formation of a passivating coating of zinc silicate on the surfaces of the metals exposed to the water. The metal surfaces are preconditioned by contact with water containing a soluble zinc salt in an amount from about 0.5 to about 5 parts zinc per million weight parts of the water while the total alkalinity is maintained above 100 millequivalents by the addition of a water soluble alkaline material, as needed. The pretreatment passivates the metal surfaces with a coating of zinc carbonate, as can be determined by measuring the magnitude of external current flow between electrodes of a test probe maintained in the water. When the metal has been coated with a film of zinc carbonate, typically after a few days to a week, the addition of the zinc salt is ceased, and a water soluble silicate, particularly sodium orthsilicate or sodium metasilicate is added to the water in an amount from about 1 to 10 parts per million of silicate. The addition of this silicate effectively deposits a protective coating of zinc silicate on the surfaces of the metal subjected to corrosion, particularly the surfaces of cathodic metals.
REFERENCES:
patent: 3960576 (1976-06-01), Carter et al.
patent: 4239648 (1980-12-01), Marshall et al.
patent: 4268397 (1981-05-01), Horie et al.
Stericker, William, "Sodium Silicates in Water to Prevent Corrosion", Jul. 27, 1937.
Uhlig, Herbert, "Corrosion and Corrosion Control", Chapter 5, p. 57, 1963.
"Betz Handbook of Industrial Water Conditioning", 7th ed., pp. 200-201, 1976.
Hruskoci Peter
Shideler Krisanne
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