The advancement of nanotechnology has had an impact on the use of heat exchangers. Nanocoolants, which offer higher thermal efficiency than traditional coolants, have paid significant attention. These innovative fluids, which contain nanomaterials, not only have better heat efficiency but also improve energy efficiency compared to regular coolants. However, the presence of solid nanoparticles in the coolant may cause corrosion and erosion of tubes, leading to massive degradation of those parts. To evaluate the effectiveness of nanocoolant particles, this research was conducted by studying the impact of using nanocoolant on erosion-corrosion occurring on metal surfaces. The study focused on the erosion-corrosion of stainless steel (AISI 316) in coolant solutions containing nanoparticles. The experiments utilized a rotating cylinder electrode (RCE) with rotational speeds ranging from 0 to 1800 rpm and a temperature range of 30°C-70°C. The corrosion rate was determined using the linear polarization resistance (LPR) method, while the erosion was measured by calculating the average surface roughness of the samples. The design of the experiment (DOE) was utilized to find the mathematical expressions of the effects of the nanocoolant on erosion and corrosion. The findings revealed that the corrosion rate and surface roughness of the samples increased with an increase in temperature and rotation speed. Furthermore, the erosion-corrosion effects of the nanocoolant were less significant in stagnant conditions than in flow conditions, and significant differences were observed when compared with conventional coolant. Additionally, synergistic erosion and corrosion processes were detected at higher temperatures and higher rotation speeds for both types of coolants.

Yuli Panca Asmara

Jeya gopi Raman

Suparjo

Firda Herlina

Yap Chun Wei

Empirical Study of the Effect of Nanocoolant Particles on Corrosion Rate of 316 Stainless Steel

The study of pipeline corrosion is crucial to prevent economic losses, environmental degradation, and worker safety. In this study, several machine learning methods such as recursive feature elimination (RFE), principal component analysis (PCA), gradient boosting method (GBM), support vector machine (SVM), random forest (RF), K-nearest neighbors (KNN), and multilayer perceptron (MLP) were used to estimate the thickness loss of a slurry pipeline subjected to erosion corrosion. These different machine learning models were applied to the raw data (the set of variables), to the variables selected by RFE, and to the variables selected by PCA (principal components), and a comparative analysis was carried out to find out the influence of the selection and transformation of the data on the performance of the models. The results show that the models perform better on the variables selected by RFE and that the best models are RF, SVM, and GBM with an average RMSE of 0.017. By modifying the hyperparameters, the SVM model becomes the best model with an RMSE of 0.011 and an <span class="nowrap"><svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" style="vertical-align:-0.2064009pt" id="M1" height="8.8423pt" version="1.1" viewBox="-0.0498162 -8.6359 8.28119 8.8423" width="8.28119pt"><g transform="matrix(.013,0,0,-0.013,0,0)"><path id="g113-83" d="M610 18C585 26 567 34 540 68C517 97 499 128 476 171C452 215 425 276 413 304C496 332 570 394 570 494C570 555 545 595 509 619S419 650 364 650H139L133 622C216 615 219 612 203 527L129 132C112 40 105 36 23 28L17 0H279L285 28C199 34 194 40 211 132L239 284H284C320 284 334 275 351 236C374 182 394 140 420 93C459 23 495 -1 592 -8H600L610 18ZM480 485C480 424 449 372 403 342C374 323 338 316 293 316H245L291 562C296 589 301 601 311 608S337 618 358 618C432 618 480 575 480 485Z"/></g></svg>-</span>squared of 0.83.

Abdou Khadir Dia

Axel Gambou Bosca

Nadia Ghazzali

Walk-Through Corrosion Assessment of Slurry Pipeline Using Machine Learning

The Cr<sub>2</sub>O<sub>3</sub> coating on the surface of ASTM A516 Grade 70 mild steel substrates was developed using the thermal plasma spraying process for protection against corrosion and wear. The microstructural behaviours for both coating and substrate were analysed using SEM and XRD techniques. The corrosion behaviours of the coatings and substrate in synthetic mine water with varying pH values (6, 3, and 1) were evaluated according to ASTM standards for potentiodynamic polarisation measurements. Tafel plots were drawn to determine the corrosion rates. Vickers hardness of the coatings and substrate were measured. The Cr<sub>2</sub>O<sub>3</sub> coating exhibited cracks due to the solidification and cooling process, as well as some pores between the top and bonding layers caused by unmelted or partially melted particles. The corrosion tests revealed that a decrease in pH levels led to increased corrosion rates in both samples. The Cr<sub>2</sub>O<sub>3</sub> coating demonstrated superior corrosion resistance, ranging from <span class="inline_break"><svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" width="38.461pt" style="vertical-align:-0.3499298pt" id="M1" height="8.69875pt" version="1.1" viewBox="-0.0498162 -8.34882 38.461 8.69875"><g transform="matrix(.013,0,0,-0.013,0,0)"><path id="g113-49" d="M241 635C89 635 35 457 35 312C35 153 89 -12 240 -12C390 -12 443 166 443 312C443 466 390 635 241 635ZM238 602C329 602 354 454 354 312C354 172 330 22 240 22C152 22 124 173 124 313S148 602 238 602Z"/></g><g transform="matrix(.013,0,0,-0.013,6.24,0)"><path id="g113-47" d="M113 -12C146 -12 170 11 170 46C170 78 146 103 114 103S58 78 58 46C58 11 82 -12 113 -12Z"/></g><g transform="matrix(.013,0,0,-0.013,9.204,0)"><use xlink:href="#g113-49"/></g><g transform="matrix(.013,0,0,-0.013,15.444,0)"><path id="g113-52" d="M285 378C315 398 338 416 353 432C373 451 384 474 384 503C384 579 325 635 236 635H235C182 635 136 610 108 579L65 516L85 496C110 533 150 575 205 575C258 575 300 543 300 481C300 407 232 369 141 339L147 310C163 315 188 321 211 321C268 321 338 284 338 192C338 94 288 40 217 40C160 40 119 68 93 91C85 98 77 97 69 91C60 84 47 71 46 58C44 46 48 35 62 22C75 10 116 -12 162 -12C234 -12 424 62 424 224C424 297 373 359 285 376V378Z"/></g><g transform="matrix(.013,0,0,-0.013,21.684,0)"><path id="g113-55" d="M137 343C167 482 260 545 321 574C357 591 397 603 429 609L423 641C382 634 335 622 295 608C189 570 37 457 37 238C37 84 125 -12 242 -12C362 -12 447 89 447 209C447 311 374 393 267 393C247 393 226 386 204 376L137 343ZM227 337C318 337 361 256 361 173C361 105 336 22 258 22C176 22 126 120 126 240C126 266 127 291 132 310C155 323 189 337 227 337Z"/></g><g transform="matrix(.013,0,0,-0.013,30.83,0)"><path id="g117-37" d="M535 290V340H323V533H265V340H52V290H265V84H323V290H535ZM535 -22V28H52V-22H535Z"/></g></svg><span class="ibiop"/><svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" width="28.262pt" style="vertical-align:-0.3499298pt" height="8.69875pt" version="1.1" viewBox="41.3161838 -8.34882 28.262 8.69875"><g transform="matrix(.013,0,0,-0.013,41.366,0)"><use xlink:href="#g113-49"/></g><g transform="matrix(.013,0,0,-0.013,47.606,0)"><use xlink:href="#g113-47"/></g><g transform="matrix(.013,0,0,-0.013,50.57,0)"><use xlink:href="#g113-49"/></g><g transform="matrix(.013,0,0,-0.013,56.81,0)"><use xlink:href="#g113-49"/></g><g transform="matrix(.013,0,0,-0.013,63.05,0)"><use xlink:href="#g113-52"/></g></svg></span> mm/year to <span class="inline_break"><svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" width="38.461pt" style="vertical-align:-0.3499298pt" id="M2" height="8.69875pt" version="1.1" viewBox="-0.0498162 -8.34882 38.461 8.69875"><g transform="matrix(.013,0,0,-0.013,0,0)"><use xlink:href="#g113-49"/></g><g transform="matrix(.013,0,0,-0.013,6.24,0)"><use xlink:href="#g113-47"/></g><g transform="matrix(.013,0,0,-0.013,9.204,0)"><path id="g113-50" d="M384 0V27C293 34 287 42 287 114V635C232 613 172 594 109 583V559L157 557C201 555 205 550 205 499V114C205 42 199 34 109 27V0H384Z"/></g><g transform="matrix(.013,0,0,-0.013,15.444,0)"><use xlink:href="#g113-50"/></g><g transform="matrix(.013,0,0,-0.013,21.684,0)"><use xlink:href="#g113-49"/></g><g transform="matrix(.013,0,0,-0.013,30.83,0)"><use xlink:href="#g117-37"/></g></svg><span class="ibiop"/><svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" width="28.262pt" style="vertical-align:-0.3499298pt" height="8.69875pt" version="1.1" viewBox="41.3161838 -8.34882 28.262 8.69875"><g transform="matrix(.013,0,0,-0.013,41.366,0)"><use xlink:href="#g113-49"/></g><g transform="matrix(.013,0,0,-0.013,47.606,0)"><use xlink:href="#g113-47"/></g><g transform="matrix(.013,0,0,-0.013,50.57,0)"><use xlink:href="#g113-49"/></g><g transform="matrix(.013,0,0,-0.013,56.81,0)"><use xlink:href="#g113-49"/></g><g transform="matrix(.013,0,0,-0.013,63.05,0)"><path id="g113-53" d="M456 178V225H360V632H320C217 496 115 347 20 206V178H280V106C280 40 276 34 189 27V0H445V27C364 34 360 39 360 106V178H456ZM280 225H82C149 335 214 431 278 520H280V225Z"/></g></svg></span> mm/year, compared to the mild steel substrate, which ranged from <span class="inline_break"><svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" width="38.461pt" style="vertical-align:-0.3499298pt" id="M3" height="8.69875pt" version="1.1" viewBox="-0.0498162 -8.34882 38.461 8.69875"><g transform="matrix(.013,0,0,-0.013,0,0)"><use xlink:href="#g113-49"/></g><g transform="matrix(.013,0,0,-0.013,6.24,0)"><use xlink:href="#g113-47"/></g><g transform="matrix(.013,0,0,-0.013,9.204,0)"><path id="g113-51" d="M412 140C382 77 369 73 315 73H129L270 222C362 320 402 379 402 466C402 571 322 635 234 635C177 635 130 609 99 576L42 495L64 475C90 514 133 568 201 568C274 568 318 519 318 435C318 349 255 267 193 193C144 135 87 78 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xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" width="38.461pt" style="vertical-align:-0.3499298pt" id="M4" height="8.69875pt" version="1.1" viewBox="-0.0498162 -8.34882 38.461 8.69875"><g transform="matrix(.013,0,0,-0.013,0,0)"><use xlink:href="#g113-49"/></g><g transform="matrix(.013,0,0,-0.013,6.24,0)"><use xlink:href="#g113-47"/></g><g transform="matrix(.013,0,0,-0.013,9.204,0)"><use xlink:href="#g113-52"/></g><g transform="matrix(.013,0,0,-0.013,15.444,0)"><use xlink:href="#g113-52"/></g><g transform="matrix(.013,0,0,-0.013,21.684,0)"><use xlink:href="#g113-55"/></g><g transform="matrix(.013,0,0,-0.013,30.83,0)"><use xlink:href="#g117-37"/></g></svg><span class="ibiop"/><svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" width="28.261pt" style="vertical-align:-0.3499298pt" height="8.69875pt" version="1.1" viewBox="41.317183799999995 -8.34882 28.261 8.69875"><g transform="matrix(.013,0,0,-0.013,41.367,0)"><use xlink:href="#g113-49"/></g><g transform="matrix(.013,0,0,-0.013,47.607,0)"><use xlink:href="#g113-47"/></g><g transform="matrix(.013,0,0,-0.013,50.571,0)"><use xlink:href="#g113-49"/></g><g transform="matrix(.013,0,0,-0.013,56.811,0)"><use xlink:href="#g113-51"/></g><g transform="matrix(.013,0,0,-0.013,63.051,0)"><use xlink:href="#g113-55"/></g></svg></span> mm/year, across all pH values. Moreover, it exhibited significantly greater hardness (<span class="inline_break"><svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" width="35.497pt" style="vertical-align:-0.3499298pt" id="M5" height="8.69875pt" version="1.1" viewBox="-0.0498162 -8.34882 35.497 8.69875"><g transform="matrix(.013,0,0,-0.013,0,0)"><use xlink:href="#g113-50"/></g><g transform="matrix(.013,0,0,-0.013,6.24,0)"><use xlink:href="#g113-51"/></g><g transform="matrix(.013,0,0,-0.013,12.48,0)"><use xlink:href="#g113-55"/></g><g transform="matrix(.013,0,0,-0.013,18.72,0)"><use xlink:href="#g113-49"/></g><g transform="matrix(.013,0,0,-0.013,27.866,0)"><use xlink:href="#g117-37"/></g></svg><span class="ibiop"/><svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" width="12.749pt" style="vertical-align:-0.3499298pt" height="8.69875pt" version="1.1" viewBox="38.3521838 -8.34882 12.749 8.69875"><g transform="matrix(.013,0,0,-0.013,38.402,0)"><path id="g113-56" d="M447 623H65C61 580 56 530 47 475H76C100 541 106 550 172 550H388C308 376 196 170 91 -1L98 -12L172 -2C268 204 360 408 455 611L447 623Z"/></g><g transform="matrix(.013,0,0,-0.013,44.644,0)"><use xlink:href="#g113-56"/></g></svg></span> HV<sub>3</sub>) than the mild steel substrate (<span class="inline_break"><svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" width="29.257pt" style="vertical-align:-0.3499298pt" id="M6" height="8.69875pt" version="1.1" viewBox="-0.0498162 -8.34882 29.257 8.69875"><g transform="matrix(.013,0,0,-0.013,0,0)"><use xlink:href="#g113-50"/></g><g transform="matrix(.013,0,0,-0.013,6.24,0)"><path id="g113-57" d="M249 635C141 635 70 555 70 471C70 401 114 353 179 316C143 294 106 267 90 252C68 231 45 202 45 157C45 50 130 -12 237 -12C322 -12 435 52 435 169C435 256 372 304 303 343C349 374 375 398 383 407C401 429 411 458 411 487C411 569 344 635 249 635ZM238 603C285 603 337 567 337 482C337 422 310 385 276 358C205 393 145 426 145 500C145 552 179 603 238 603ZM248 20C183 20 125 70 125 163C125 218 158 268 206 300C284 261 355 217 355 143C355 66 308 20 248 20Z"/></g><g transform="matrix(.013,0,0,-0.013,12.48,0)"><use xlink:href="#g113-49"/></g><g transform="matrix(.013,0,0,-0.013,21.626,0)"><use xlink:href="#g117-37"/></g></svg><span class="ibiop"/><svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" width="12.725pt" style="vertical-align:-0.3499298pt" height="8.69875pt" version="1.1" viewBox="32.1121838 -8.34882 12.725 8.69875"><g transform="matrix(.013,0,0,-0.013,32.162,0)"><use xlink:href="#g113-50"/></g><g transform="matrix(.013,0,0,-0.013,38.402,0)"><use xlink:href="#g113-53"/></g></svg></span> HV<sub>3</sub>). The lower corrosion rates and higher hardness of Cr<sub>2</sub>O<sub>3</sub> coating than the mild steel substrate make it a suitable coating in applications where corrosion resistance and high hardness properties are essential.

Silas I. Hango

Lesley A. Cornish

Josias W. van der Merwe

Lesley H. Chown

Corrosion Behaviour of a Cr<sub>2</sub>O<sub>3</sub> Coating on Mild Steel in Synthetic Mine Water

The recent failures in flexible pipes have motivated the exhaustive research of corrosion mechanisms on high-strength carbon steel armor wires that are the main structural compounds of those structures that mostly operate in seawater environments in the presence of carbon dioxide (CO<sub>2</sub>) and confined spaces. Recently, the literature reported discoveries about electrolyte properties (as Fe<sup>+2</sup><sub>(aq)</sub>/HCO<sub>3</sub><sup>-</sup><sub>(aq.)</sub> ratio) and supersaturation, near neutral pH inside the confined space, multiphase reactions of contaminants present in CO<sub>2</sub> gas, the formation and dissolution mechanism of FeCO<sub>3</sub> film, and interaction of CO<sub>2</sub> gas impurities with the corrosion scale. Therefore, this review is aimed at presenting an up-to-date narrative of the CO<sub>2</sub> corrosion phenomenon in carbon steel, connecting background fundamentals with current data studies.

D. Fonseca

M. R. Tagliari

W. C. Guaglianoni

S. M. Tamborim

M. F. Borges

Carbon Dioxide Corrosion Mechanisms: Historical Development and Key Parameters of CO<sub>2</sub>-H<sub>2</sub>O Systems

A compound 2-(6,8-dibromo-3-(4-hydroxycyclohexyl)-1,2,3,4-tetrahydroquinazolin-2-yl)phenol was synthetised from ambroxol hydrochloride and salicylaldehyde. The structure of the compound was studied with UV, IR, Raman, and <sup>1</sup>H NMR spectroscopy. The inhibitory ability of the synthetised compound on the corrosion of mild stainless steel EN Fe37-3FN in 0.5 M hydrochloric acid solution was studied using gravimetric and electrochemical methods, including potentiodynamic polarisation and EIS. It was shown that the inhibitory activity of the compound increases with the increase of its concentration in a solution. An addition of 3 mg/l of the compound reduces the corrosion rate by 20% and that of 400 mg/l by 85%. The data of gravimetric and electrochemical measurements coincide well. The sorption of the compound on the metal surface obeys the Langmuir adsorption isotherm, and the nature of adsorption is physical. The compound exhibits the chelating activity with both ferrous and ferric ions in the acidic solution. The synthetised compound may be a good choice for the inhibition of steel corrosion in acidic environments.

Pavel Anatolyevich Nikolaychuk

Aleksandr Igorevich Biryukov

Artem Vladimirovich Sharov

Leon Olegovich Burmistrov

Natalya Sergeevna Amelina

Anastasia Andreevna Tereshkina

The Inhibitory Properties of the Ambroxol Derivative on the Corrosion of Mild Steel in Hydrochloric Acid Medium

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<p><em>International Journal of Corrosion </em>publishes research dedicated to understanding, managing, and preventing corrosion in all its manifestations. The journal welcomes the submission of both fundamental and highly applied studies.</p>


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International Journal of Corrosion - Table of contents 2024

International Journal of Corrosion | Hindawi

title

International Journal of Corrosion publishes research dedicated to understanding, managing, and preventing corrosion in all its manifestations. The journal welcomes the submission of both fundamental and highly applied studies.

International Journal of Corrosion