Ant-nest corrosion failure of heat exchangers copper pipes

Cozzarini, Luca; Marsich, Lucia; Schmid, Chiara

doi:10.1016/j.engfailanal.2020.104387

Cited by 19 publications

(14 citation statements)

References 14 publications

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“…The global problem of corrosion is very challenging, and it is bothering the humankind for many centuries. Corrosion is considered as the most critical cause of material failure in all the industries where metallic parts are applied. − Organic coatings often are used to overcome corrosion challenges by limiting the contact of the metallic surfaces with an aggressive environment . During the operation, the protective coatings may get damaged, which allows the aggressive media to penetrate the base metals and initiate corrosion .…”

Section: Introductionmentioning

confidence: 99%

Hybrid Halloysite Nanotubes as Smart Carriers for Corrosion Protection

Khan

Hassanein

Habib

et al. 2020

ACS Appl. Mater. Interfaces

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Novel hybrid halloysite nanotubes (HHNTs) were developed and used as smart carriers for corrosion protection of steel. For this purpose, as-received halloysite nanotubes (HNTs) were loaded with a corrosion inhibitor, imidazole (IM), by vacuum encapsulation. In the next step, a layer by layer technique was employed to intercalate another inhibitor, dodecylamine (DDA), in the polyelectrolyte multilayers of polyethylenimine and sulfonated polyether ether ketone, leading to the formation of HHNTs. During this process, IM (5 wt %) was successfully encapsulated into the lumen of HNTs, while DDA (0.4 wt %) was effectively intercalated into the polyelectrolyte layers. Later, the HHNTs (3 wt %) were thoroughly dispersed into the epoxy matrix to develop smart hybrid self-healing polymeric coatings designated as hybrid coatings. For a precise evaluation, epoxy coatings containing as-received HNTs (3 wt %) without any loading denoted to as reference coatings and modified coatings containing HNTs loaded with IM-loaded HNTs (3 wt %) were also developed. A comparative analysis elucidates that the hybrid coatings demonstrate decent thermal stability, improved mechanical properties, and promising anticorrosion properties compared to the reference and modified coatings. The calculated corrosion inhibition efficiencies of the modified and hybrid coatings are 92 and 99.8%, respectively, when compared to the reference coatings. Noticeably, the superior anticorrosion properties of hybrid coatings can be attributed to the synergetic effect of both the inhibitors loaded into HHNTs and their efficient release in response to the localized pH change of the corrosive medium. Moreover, IM shows an active release in both acidic and basic media, which makes it suitable for the protection of steel at the early stages of damage, while DDA being efficiently released in the acidic medium may contribute to impeding the corrosion activity at the later stages of deterioration. The tempting properties of hybrid coatings demonstrate the beneficial role of the development of novel HHNTs and their use as smart carriers in the polymeric matrix for corrosion protection of steel.

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Section: Introductionmentioning

confidence: 99%

Hybrid Halloysite Nanotubes as Smart Carriers for Corrosion Protection

Khan

Hassanein

Habib

et al. 2020

ACS Appl. Mater. Interfaces

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“…The copper has been used due to its high thermal conductivity (Thermal conductivity = 385 W/mK) to facilitate better heat transfer from the PV surface to the fluid stream. 26 The PV module used are transparent and manufactured at Central Electronics Limited, Sahibabad, Uttar Pradesh. The first PV/T, that is, PV/T-RS has copper tubes arranged in rectangular spiral pattern and glued directly to the bottom PV surface using transparent epoxy glue (Thermal conductivity = 0.14 W/mK).…”

Section: Pv/t Prototype and Experimental Setup Descriptionmentioning

confidence: 99%

Performance investigation of transparent photovoltaic‐thermal collector with horizontal oscillating and rectangular spiral flow patterns

Das

Kamble

Kalita

2020

Intl J of Energy Research

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Efficiency drop due to increase in photovoltaic (PV) module operating temperature creates a huge difference between the projected and actual electricity generated in large power plants. As a solution to this problem Photovoltaic-Thermal (PV/T) collector, with PV at top and thermal collector at the bottom has been developed. PV/T can cool the PV as well as generate low-temperature thermal energy. This article presents a comparative experimental study of two newly developed PV/T collector having transparent solar panel with copper tube absorber arranged in rectangular spiral (PV/T-RS) and horizontal oscillating

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“…Furthermore, various kinds of carboxylic acids have different effects on the corrosion of copper tubes. [13,14] Besides stress corrosion, other corrosions induced by ions also contribute to the failure of copper tubes. [15] Situmorang et al [16] reported that the corrosion rate of copper tubes in CH 3 COOH is the fastest in all carboxylic acids and the corrosion mechanisms of copper tubes in HCOOH are more complex.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparison of the corrosion behavior of copper tubes in formic acid and acetic acid environment

Liu

Zhao

et al. 2021

Materials & Corrosion

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Carboxylic acids with different carbon chains have different corrosion behaviors on copper tubes. In this paper, corrosion behavior and corrosion mechanisms of copper tubes in formic acid (HCOOH) and acetic acid (CH 3 COOH) were analyzed by vapor corrosion tests, electrochemical tests, contact angle examination, optical microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction. The corrosion process of copper tubes in the HCOOH environment is more complex than in the CH 3 COOH environment and HCOOH is easy to cause "ant nest" corrosion on copper tubes. The corrosion rate is faster and the surface of the copper tube is more easily corroded in the CH 3 COOH environment due to the formation of unstable and loose corrosion products, Cu(OH)(CH 3 COO) 2 •2H 2 O. The results of the contact angle examination showed that the contact angles of HCOOH and CH 3 COOH on copper tube surface were 25°and 9°, respectively, which means that CH 3 COOH is more likely to be absorbed by the surface of the copper tube evenly. Differences in the wettability of these two carboxylic acids with copper tubes are the main reason for the different corrosion phenomena. The corrosion mechanisms of copper tubes in carboxylic acid are also discussed.

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Ant-nest corrosion failure of heat exchangers copper pipes

Cited by 19 publications

References 14 publications

Hybrid Halloysite Nanotubes as Smart Carriers for Corrosion Protection

Hybrid Halloysite Nanotubes as Smart Carriers for Corrosion Protection

Performance investigation of transparent photovoltaic‐thermal collector with horizontal oscillating and rectangular spiral flow patterns

Comparison of the corrosion behavior of copper tubes in formic acid and acetic acid environment

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