Evaluation of volatile corrosion inhibitors in the presence of condensation water by electrochemical methods

Sieber, Maximilian; Lautner, Silke; Faßbender, F

doi:10.1088/1757-899x/480/1/012029

Cited by 2 publications

(8 citation statements)

References 9 publications

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“…Figure 7. Mean values and 2σ-intervals of the logarithmized polarization resistance for a sample of 10 independent tests without VCI with respect to the heuristically established limit for corrosion indication of 30 kΩ·cm² [17]. The upper value of the 5σ-interval approximately matches the established limit for corrosion indication.…”

Section: Reproducibility Of Corrosive Load In the Proposed Test And Ementioning

confidence: 56%

“…This is explained with the state of the metallic sample surface. Preliminary investigations [17] including stopped tests have shown a strong correlation of the measured electrochemical values and the occurrence of corrosion on the surface. With the established test regime ( Figure 3) with 3 short cycles of climatic stress (stage 2) with low amounts of humidity condensation and evaporation and a final, longer cycle of climatic stress (stage 4) with excessive humidity condensation on the sample surface, it is rather unlikely that the surface is in the stage of early corrosion at the particular point of time, at which the polarization resistance is measured for quality assessment of the respective VCI-films.…”

Section: Reproducibility Of Corrosive Load In the Proposed Test And Ementioning

confidence: 95%

“…For tests without any VCI, Figure 7 depicts the results, the corresponding mean values and the 2σ-intervals with respect to the heuristically established limit of 30 kΩ·cm² (approx. 4.5 on logarithmic scale), below which a significant corrosion attack takes place on the active surface of the metallic sample [17]. In contrast, values of the polarization resistance above 30 kΩ·cm² indicate a good corrosion protection effect.…”

Section: Reproducibility Of Corrosive Load In the Proposed Test And Ementioning

confidence: 98%

“…In that case, the contained humidity condenses inside the packaging and drops onto the packaged goods. After the end of the test, the metallic sample was dried outside the chamber under a stream of warm air [17].…”

Section: Sample Materials and Test Arrangementmentioning

confidence: 99%

“…no temperature regulation). Corrosive stress is applied on the metallic sample in test stages 2 and 4, when the sample is cooled below the dew point of the atmosphere in the chamber [17].…”

Section: Test Regime Electrochemical Measurementsmentioning

confidence: 99%

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Test method and device for evaluation of volatile corrosion inhibitors

2019

Int. J. Corros. Scale Inhib.

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Volatile corrosion inhibitors (VCI), which are incorporated in packaging materials like films, papers, plastic racks etc., are a suitable means for temporary corrosion protection during transport and storage of metallic products. For the evaluation of the corrosion protection effect of VCI-containing products, numerous tests are established. In most cases, principally, a metallic sample is exposed to a climatic stress in presence of a VCI-containing product and the protection effect of the VCI is evaluated afterwards by visually assessing the occurrence/absence of corrosion products at the sample surface. In a newly proposed test method and a dedicated device, the evaluation of the VCI-containing product is based on electrochemical measurements at the interface between the metallic sample and a film of condensed water. The water film is precipitated during the test by actively cooling the metallic sample below the dew point, which imposes a corrosive stress on the sample surface. With a simple direct current potentiostat for polarization resistance measurement, the state of the metallic surface (corrosion-active, passive) is registered objectively during the test and thus the corrosion protection effect of the VCI is evaluated. In the present paper, the test method and the dedicated device are disclosed in detail. On the basis of a statistical analysis of a sample of independently repeated tests, limit values are established for the quality assessment of VCI products. Different commercially available VCI films are evaluated and the results are compared to the state-of-the-art jar test procedure based on German TL 8135. In conclusion, the proposed test reproducibly provides objective and quantitative information on the corrosion protection effect of VCI-containing products.

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Section: Reproducibility Of Corrosive Load In the Proposed Test And Ementioning

confidence: 56%

Section: Reproducibility Of Corrosive Load In the Proposed Test And Ementioning

confidence: 95%

Section: Reproducibility Of Corrosive Load In the Proposed Test And Ementioning

confidence: 98%

Section: Sample Materials and Test Arrangementmentioning

confidence: 99%

“…no temperature regulation). Corrosive stress is applied on the metallic sample in test stages 2 and 4, when the sample is cooled below the dew point of the atmosphere in the chamber [17].…”

Section: Test Regime Electrochemical Measurementsmentioning

confidence: 99%

See 3 more Smart Citations

Test method and device for evaluation of volatile corrosion inhibitors

2019

Int. J. Corros. Scale Inhib.

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Optimization and characterisation of commercial water-based volatile corrosion inhibitor

2019

Int. J. Corros. Scale Inhib.

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Volatile corrosion inhibitor (VCI) provides protection for metal surfaces. VCI coating and molecules attach themselves to metal surfaces to form both a physical film when contacted and an invisible thin film for indirect contact through Vapour (only a few molecules thick), thus inhibiting metals atmospheric corrosion. Optimization and characterisation of commercial water-based volatile corrosion inhibitor VCI (Vapour-Phase-Protection, VAPPRO 837C diluted commercial solution from CORPPRO) was prepared to determine their characteristics and effectiveness against corrosion of carbon steel. The main scope of this work is to characterise the rheological and corrosion inhibition properties of the VAPPRO 837C with varying formulations and processing parameters (coating and drying times). Different tests were performed to determine the corrosion behavior of inhibitor. The application of VCI on the metal surface was done by dip-coating process. An Electrochemical Workstation from HCH Instruments has been used to evaluate the corrosion inhibition efficiency of the VCI and to determine the corrosion rate of the uncoated and coated samples. In addition, viscosity tests were carried out in order to determine the rheological properties of the formulation, as well as Freeze-Thaw resistance of water-borne coatings and pH tests were done. A FTIR spectrometer has been used to determine the functional groups present at a specific concentration. Results reveal that the most effective VCI film was obtained from a 0.25 CORPPRO (Concentrated VCI) (vol%) formulation using a coating time of 10 min and a drying time of 24 h. Therefore, 0.25 CORPPRO would be the optimum concentration to be used because it is able to achieve the highest corrosion inhibition efficiency with the optimum coating drying time.

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Evaluation of volatile corrosion inhibitors in the presence of condensation water by electrochemical methods

Cited by 2 publications

References 9 publications

Test method and device for evaluation of volatile corrosion inhibitors

Test method and device for evaluation of volatile corrosion inhibitors

Optimization and characterisation of commercial water-based volatile corrosion inhibitor

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