Operating principle of volatile corrosion inhibitors in the jar test

Rymer, Lisa-Marie; Sieber, Maximilian; Lautner, Silke; Faßbender, F

doi:10.1088/1757-899x/480/1/012028

Cited by 3 publications

(3 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The steel specimens used for the jar tests and the specimen used in the newly proposed test were from the same material batch (section 2.1). The test arrangement is shown in Figure 4, a detailed description of the test is given in [18]. After another 2 h of conditioning in the humidified atmosphere, the jar is put in a pre-heated cabinet at 40 °C for 2 h and afterwards, the corrosion protection effect of the VCI-film is evaluated based on the surface appearance of the metallic sample (a).…”

Section: Jar Testmentioning

confidence: 99%

See 1 more Smart Citation

Test method and device for evaluation of volatile corrosion inhibitors

2019

Int. J. Corros. Scale Inhib.

View full text Add to dashboard Cite

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.

show abstract

Section: Jar Testmentioning

confidence: 99%

“…After another 2 h of conditioning in the humidified atmosphere, the jar is put in a pre-heated cabinet at 40 °C for 2 h and afterwards, the corrosion protection effect of the VCI-film is evaluated based on the surface appearance of the metallic sample (a). [18]…”

Section: Jar Testmentioning

confidence: 99%

Test method and device for evaluation of volatile corrosion inhibitors

2019

Int. J. Corros. Scale Inhib.

View full text Add to dashboard Cite

show abstract

“…This may be due to the formation of a protective film of molecules on the metal surface and a mixedeffect of inhibition. Different articles have suggested this mechanism of inhibition [20,21]. Most VCIs form a film by surface adsorption upon hydrolysis or dissociation.…”

Section: Polarisation Curvesmentioning

confidence: 99%

Optimization and characterisation of commercial water-based volatile corrosion inhibitor

2019

Int. J. Corros. Scale Inhib.

View full text Add to dashboard Cite

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.

show abstract

Study on the Performance and Mechanism of Morpholine Salt Volatile Corrosion Inhibitors on Carbon Steel

Zhao,

Zhang,

et al. 2024

Coatings

View full text Add to dashboard Cite

A series of morpholine salt volatile corrosion inhibitors (VCIs) were synthesized via solid-phase chemical reactions. The corrosion inhibition performance was assessed using evaporation weight loss, VCI capability, and corrosion weight loss tests. The corrosion inhibition mechanisms of the morpholine salt VCIs for carbon steel in atmospheric conditions were explored through electrochemical testing under thin film electrolytes, X-ray photoelectron spectroscopy (XPS), and computational simulations. Morpholine carbonate exhibited higher volatility. Corrosion weight loss tests showed an >85% reduction for steel treated with morpholine benzoate or morpholine carbonate. The inhibitors’ inhibition mechanism, elucidated through X-ray photoelectron spectroscopy (XPS) and computational simulations, revealed that morpholine carbonate and benzoate form protective layers via physical and chemical adsorption on the steel surface, coordinating with iron atoms through nitrogen and oxygen atoms. Quantum chemical calculations demonstrated that morpholine carbonate had stronger adsorption energy and electron transfer capabilities, indicating superior corrosion inhibition performance over morpholine benzoate.

show abstract

Operating principle of volatile corrosion inhibitors in the jar test

Cited by 3 publications

References 6 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

Study on the Performance and Mechanism of Morpholine Salt Volatile Corrosion Inhibitors on Carbon Steel

Contact Info

Product

Resources

About