Cathodic Disbondment Tester - CD Tester

Caltech Engineering Services India is a leading manufacturer for cathodic disbonding tester. CD Tester or cathodic disbonding tester is designed to test and accurately determine the characteristics of insulating coating systems applied over steel material. Cathodic disbonding test method determines the resistance to cathodic disbonding of a coating system between coating and steel substrate, resulting in loss of coating adhesion. Purpose of coating system is to prevent corrosion that could occur in the underground pipeline services, and many other services as below. Importance of coating inspection is therefore highly important. Underground pipes are coated and cathodically protected. Applied cathodic protection potentials may cause loosening of the coating, beginning at holiday edges. Spontaneous holidays may also be caused by such potentials. Cathodic disbondment test equipment provides accelerated conditions for cathodic disbondment to occur and provides a measure of resistance of coatings to this type of action. This has lot of advantanges over use of power supplies and many odd connections. Cathodic disbondment tester is used in civil engineering for evaluation of epoxy coated rebars to evaluate effect of cathodic protection on epoxy-coated rebar. It is also used effectively in coating of ships and boats in marine water, offshore structures, rebars of bridges, building rebars, rebars of dam construction, rebar coatings, coated steel reinforcing bars coated galvanized steel and coated hot-dip galvazing sheets.

CD Tester - Cathodic Disbonding tester is one of the useful instrument to test and determine accelerated corrosion testing. Cathodic disbondment tester is manufactured with latest microprocessor based technology with multi channel based on potentiostat operations. The instrument is highly user friendly and can be operated by technicians without any factory training.

Cathodic Disbondment instrument has connections made easy with plug and play devices. Full details of installation and operations are given in user manual.

In electrochemical process, A potentiostat is a controlled and measured device in an electrolytic cell, keeps the potential of the working electrode at a constant level with respect to the reference electrode. It consists of an electric circuit which controls the potential across the cell by sensing changes in its resistance, varying accordingly the current supplied to the system: a higher resistance will result in a decreased current, while a lower resistance will result in an increased current, in order to keep the voltage constant.

CD Tester meets or exceeds the requirement of ASTM G8- Test methods for cathodic disbonding of pipeline coatings, ASTM G42- Standard test method for cathodic disbonding of pipeline coatings subjected to elevated temperatures, ASTM G95- Test method for cathodic disbondment test of pipeline coatings using cell method, DIN 30671 and EN 12068 standard, ISO 15711- Determination of resistance to cathodic disbonding of coatings exposed to sea water.

The adhesion of the epoxy coating to steel was tested according to ASTM A775 Cathodic Disbondment (CD) test for epoxy-coated reinforcing bars. ASTM G8 also provides the cathodic disbondment test procedure for pipeline coatings. Both tests follow similar procedures.

CD-405 Cathodic Disbondment Equipment with a supply voltage of 110~120 V or 220~240 V from Caltech Engineering Services systems was used. The prepared ECR bar was placed in an 800 ml beaker with its sealed end facing the bottom of the beaker. A 3% NaCl solution was added until 100mm of the bar length was submerged. A platinum cover anode was then placed in the electrolyte solution and it was connected to a positive terminal while the ECR bar was connected to a negative terminal as shown above.

CD-405 (Multi Channel Potentiostat) Cathodic Disbondment Tester meets or exceeds the meets or exceeds the requirement of ASTM G8, ASTM G42, ASTM A775, ASTM G95, DIN 30671, EN 12068, ISO 15711, ISO 21809, NF A 49-710 /711 and CSA-Z245 Canadian specification.

Few highlights

  • User can select potentiostat channel by using soft press key pad to see display of voltage, current.
  • User has option to carry test for single or multi channel at a time. (Max 4 Channels)
  • CD Tester with 0-4000mV ┬▒ 0.2% with current range 200mA
  • Self-calibration and function ability check at site.
  • All lemo connections for electrodes.
  • 4 acrylic glass test cups
  • 4 sets of reference electrodes
  • 1 set connection cable
  • Power supply 230 V/50 Hz (Option of 110 V also available on request)