Classifications

• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
  • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
  • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
  • C23F13/04—Controlling or regulating desired parameters
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
  • G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement

Definitions

• This invention relates to a corrosion control moriitoring method and device. It enables the user to ascertain the adequacy of a corrosion control system installed to protect a buried or submerged structure.
• Corrosion can be caused by impurities introduced into the metal during manufacture.
• the impurities and the metal have different electrical properties.
• a corrosion cell is formed between the pure and the impure metals ( Figure 1) .
• the electrical circuit that is formed causes a current to flow from the metallic anode into the electrolyte. Where this occurs, metal is lost into solution • and the structure is damaged.
• the current passes from the electrolyte to the metal and no corrosion damage occurs at this (cathode) point.
• a corrosion control system is designed to stop the metal loss at the anode. In a system, called cathodic protection, a D.C. current is caused to flow into the environmental electrolyte and from there, onto the surface of the structure.
• the corrosion control monitoring system is innovative in that it simulates the corrosion process taking place on the struc ⁇ ture, while this corrosion can be electrically measured.
• the design of the device allows the observation of the electrical behaviour of the corrosion cell while it is being connected and disconnected from the structure, and thus with and without the influence of the corrosion control system. It can there ⁇ fore be seen if the system is capable of stopping corrosion. This is achieved by the innovation of encapsulating a sample of electrolyte to form a corrosion cell within the device.
• the wiring circuit allows the corrosion prevention system to act upon the simulated corrosion cell in the same way as it would act upon a natural corrosion cell on the surface of structure.
• the circuit of the device is completed when the corrosion current passes through the environment in which the device is placed.
• Figure 1 shows the principle of the corrosion cell.
• Figure 2 shows a typical cathodic protection system.
• Figure 3 shows ' in perspective a view of the base and end of the device.
• Figure 4 shows in perspective a view of the top and end of the device.
• Figure 5 shows a secrion through the device.
• the device comprises three pieces of metal 1, 2, and 8. They are set in an electrically insulating material 7, and connected to separate electrical conductors 3, 4 and 5 passing out of the device through lead 6.
• the magnitude and direction _ of the current is noted by the operator observing the elec ⁇ trical current measuring and/or direction indication device.
• Electrical conductor 4 is then connected to the metal of the structure.
• the metals of which the device is partly made should be the same as the metals to be found on the structure to be monitored.
• a mild steel anode, and a copper cathode be used to produce and electr ⁇ rotive-force of about 0.600 V.
• the invention is applicable in all fields of technology where corrosion of structures, which are at least partly submerged or buried and thus in presence of an electrolytic environment, can occur and cathcdic protection can be utilized.

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• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Environmental Sciences (AREA)
• Physics & Mathematics (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Materials Engineering (AREA)
• Biodiversity & Conservation Biology (AREA)
• Ecology (AREA)
• Environmental & Geological Engineering (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Health & Medical Sciences (AREA)
• Analytical Chemistry (AREA)
• Biochemistry (AREA)
• General Health & Medical Sciences (AREA)
• General Physics & Mathematics (AREA)
• Immunology (AREA)
• Pathology (AREA)
• Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
• Prevention Of Electric Corrosion (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 1985
  • 1985-01-24 AU AU40682/85A patent/AU4068285A/en not_active Abandoned
  • 1985-01-24 WO PCT/EP1985/000049 patent/WO1985003311A1/en unknown
  • 1985-01-24 EP EP19850901396 patent/EP0169901A1/de not_active Withdrawn

Non-Patent Citations (1)

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