Characterization of the water uptake and electrolyte uptake of organic coatings and the consequences by means of electrochemical impedance spectroscopy and UV–vis spectroscopy

Dornbusch, Michael; Kirsch, Sebastian; Henzel, C.; Deschamps, Carina; Overmeyer, S.; Cox, K.; Wiedow, M.; Tromsdorf, Ulrich I.; Dargatz, M.; Meisenburg, U.

doi:10.1016/j.porgcoat.2015.03.016

Cited by 13 publications

(6 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…So, interface roughness increases 12× more rapidly with exposure to electrolyte than with exposure to water. Certainly, it is known in the literature that corrosion progresses much more rapidly in electrolyte than in water, − but the results here suggest that even the earlier stage of corrosion, which is disruption of the interface, also occurs more rapidly with the electrolyte. For the parameter of correlation length, we also see large differences between the coated and uncoated Al in the rate of change.…”

Section: Resultsmentioning

confidence: 54%

See 1 more Smart Citation

Following the Morphological Disruption by an Electrolyte of a Buried Interface

Yang

Jiang

et al. 2018

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

A challenge of broad interest in both materials science and biology is the study of interfaces that are buried within a structure, particularly multilayer structures. Despite the enormous costs of corrosion and many decades of corrosion research, details of the mechanisms of various sorts of corrosion are still not clear, in part due to the difficulty in interrogating the interface between the corroding metal and an organic coating, which is typically used to mitigate corrosion. Generally, the performance of such coatings is evaluated by visual inspection after exposure or by modeling impedance data, which is a process not straightforwardly connected to physical interface structures. “Rocking-curve” X-ray scattering measurements provide a means of probing such interfaces due to the ability of X-rays to penetrate materials. Here, variations in the morphology of an interface between a protective coating and a metal substrate due to exposure to an electrolyte are derived from analysis of rocking-curve data in conjunction with atomic force microscopy imaging of the outer coating surface. The interfaces of cross-linked epoxy coatings with aluminum are irreversibly changed after 12 h of contact between the electrolyte solution and the face of the coating. The character of this change varies with the molecule used to cross-link the coating. Since X-ray off-specular scattering is sensitive to changes on the nanometer scale, it is also able to register interface degradation on time scales shorter than those probed by many other techniques, potentially expediting the evaluation of coatings for protection against degradation of the interface.

show abstract

Section: Resultsmentioning

confidence: 54%

“…Disruption of the interface morphology occurs about 12 times more rapidly with exposure to either electrolyte solutions than with exposure to water. Others have shown that corrosion of Al proceeds more rapidly in the presence of electrolyte than that in the presence of water alone. − …”

Section: Resultsmentioning

confidence: 99%

Following the Morphological Disruption by an Electrolyte of a Buried Interface

Yang

Jiang

et al. 2018

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…These results indicated that the silicone coating shows good barrier properties against water penetration into the coatings. Nevertheless, it has been reported that the water uptake kinetics can also be influenced by the ions present in the electrolyte [22]. A detailed discussion on these features is beyond the scope of the current work and will be addressed in the future work.…”

Section: Water Transport Behaviour In the Cu Film/silicone Systemmentioning

confidence: 94%

“…On the other hand, the effect of chloride ions in destabilizing/degrading the interface could not be monitored from FTIR as it is not IR active. Nevertheless, prior literature confirms that the water uptake is followed by a slow ion uptake and the initiation of a corrosion process at the interface depends on the ionic rather than water arrival [22,23].…”

Section: Combined Eis and Atr-ftir Studies On Cu Film/silicone Systemmentioning

confidence: 99%

“…The EIS is a valuable continuous monitoring technique as it not only determines the barrier film dielectric properties but also probes the reaction occurring at the metal/coating interface upon exposure to a corrosive environment. Early reports on the analysis of EIS data for polymer coated system for innumerable applications proved that its sensitivity to diffusion process has made it a versatile tool for degradation studies [19][20][21][22]. Besides, attempts were made to evaluate the water uptake of the protective coatings employed in microelectronic packaging devices.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Exploring water and ion transport process at silicone/copper interfaces using in-situ electrochemical and Kelvin probe approaches

Munirathinam

Dam

Herrmann

et al. 2021

Journal of Materials Science & Technology

View full text Add to dashboard Cite

In general, packaging materials which encapsulate light emitting diodes (LEDs) and microelectronic devices offer barrier protection against several environmental hazards such as water and ionic contaminants. However, these encapsulants may provide pathways for water and ionic contaminants to reach the metal/polymer interfaces and provoke local corrosion of electronics, which is a major reliability concern for polymer encapsulated LEDs and microelectronics. As the water and corrosive constituents play a crucial role in their reliability, water uptake kinetics, interfacial ion transport and delamination behaviour of silicone coated copper model system, mimicking a typical microelectronics packaging system, is explored in the present work. Electrochemical impedance spectroscopy (EIS) integrated with attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy studies revealed that water diffusion inside the silicone network is Fickian in nature and the evolution of the observed time constants are related to the diffusion and interfacial reactions. A decrease of impedance magnitude with time was observed in EIS measurements concurrently with water absorption bands shifting towards lower wavenumber in ATR-FTIR measurements, implying the growth of strong hydrogen bonding between water molecules and the silicone network. The estimated diffusion constant of water using the capacitance method was in the order of 7 × 10 -12 m 2 s −1 and the water absorption volume fraction was in the range of 0% to 0.30%. Scanning Kelvin probe studies elucidated the ion transport process occurring at the silicone/copper interface in a humid atmosphere. The interfacial ion transport process is controlled by the interfacial electrochemical reactions at the cathodic delamination front and the estimated average delamination rate is 0.43 mm h -1/2 . This work demonstrates that exploring ion and water transport in the silicone coating and along the silicone/copper interface is of pivotal importance as part of a detailed reliability assessment of the polymer encapsulated LEDs and microelectronics.

show abstract

Comparative study between natural and artificial weathering of acrylic‐coated steel, aluminum, and galvanized steel

Cristoforetti

Rossi

Deflorian

et al. 2023

Materials & Corrosion

View full text Add to dashboard Cite

Since testing organic coatings under natural conditions is a time‐consuming process, accelerated methods are needed to produce results in less time. A simulated environment cannot fully reproduce actual operating conditions, so it is important to investigate the correlation between accelerated and natural aging test results. In this article, the natural aging of painted steel, aluminum, and hot‐dip galvanized steel is studied for 1 year under continental climate conditions. The environmental parameters responsible for the change of the protective system in a continental urban environment were monitored: time of wetness, ultraviolet radiation, and temperature. The extent of deterioration is compared with similar samples weathered by accelerated testing using electrochemical impedance spectroscopy, differential scanning calorimetry, and gloss measurements. Neutral salt spray chamber, prohesion test, immersion in a quiescent salt solution, and ultraviolet B‐rays (UVB) exposure test are considered. The results of the accelerated cabinet tests are discussed, and the effect is evaluated for the various coated metals. This study highlights the major problems encountered in building a model to predict durability in such a critical area as the durability of organic coatings for metal structures.

show abstract

Characterization of the water uptake and electrolyte uptake of organic coatings and the consequences by means of electrochemical impedance spectroscopy and UV–vis spectroscopy

Cited by 13 publications

References 32 publications

Following the Morphological Disruption by an Electrolyte of a Buried Interface

Following the Morphological Disruption by an Electrolyte of a Buried Interface

Exploring water and ion transport process at silicone/copper interfaces using in-situ electrochemical and Kelvin probe approaches

Comparative study between natural and artificial weathering of acrylic‐coated steel, aluminum, and galvanized steel

Contact Info

Product

Resources

About