Accelerated Corrosion Tests in Quality Labels for Powder Coatings on Galvanized Steel—Comparison of Requirements and Experimental Evaluation

Kunce, Izabela; Królikowska, A.; Komorowski, Leszek

doi:10.3390/ma14216547

Cited by 6 publications

(4 citation statements)

References 9 publications

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“…Neutral and acid salt spray tests are commonly utilized to evaluate the corrosion resistance of materials, coatings, or specimens [26][27][28], where the acid salt spray test is more rigorous for acidic environments [29]. The addition of acetic acid can accelerate the corrosion process, with an acceleration effect three times faster than that of a neutral environment [30].…”

Section: Salt Spray Test Of Steel Wiresmentioning

confidence: 99%

Fatigue Behavior and Fracture Surface Analysis of Corroded High-Strength Bridge Cable Wires

Liu,

Guo,

et al. 2024

Materials

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Bridge cable wires suffer from alternating stress and environmental erosion, leading to premature failure prior to its design life. This paper investigates the fatigue and mechanical behaviors of corroded bridge cable wires with a zinc–aluminum (Zn-Al) alloy coating. Based on the salt spray corrosion test and microstructure analysis, the anti-corrosion resistance and corrosion appearance characteristics of the Zn-Al alloy coating and galvanized coating were investigated. The Zn-Al alloy coating was superior in resistance to corrosion fatigue for the improvement in toughness and the generation of anti-corrosion Zn-Al and Fe-Zn-Al phases. Equations of the accelerated corrosion depth of the steel wires had been regressed to roughly estimate the corrosion life of the Zn-Al alloy coating, which can reach 29.1 years with a thickness of 70 μm. The fatigue and mechanical properties of the bare wires after the salt spray test were further studied based on tensile tests and fatigue tests. The fatigue properties of the bridge cable wire would decrease with the corrosion degree due to the deterioration and embrittlement of materials, where ductility characterized by the elongation rate was the most affected. Fracture surfaces of the wires were captured and analyzed based on a method for recognizing graphical contours. Insufficient fatigue life may occur in the steel wires after corrosion and increase with the degree of corrosion. The pit depth logarithmically weakened the fatigue life of steel wires for the weakening of fatigue toughness and the bearing area. The flat fracture was more common with a single fatigue source, while multiple fatigue sources led to step-like fractures for the generation of multiple dispersed crack propagation regions. Corrosion fatigue was more sensitive to the existence of fatigue sources than the reduction. Multiple initiation sources significantly reduced the fatigue life due to the cracking facilitation of the joint effect of multiple pits. The electrochemical reactions of corrosion can lead to material embrittlement and a reducing effect on the fracture toughness of the steel wires.

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Section: Salt Spray Test Of Steel Wiresmentioning

confidence: 99%

Fatigue Behavior and Fracture Surface Analysis of Corroded High-Strength Bridge Cable Wires

Liu,

Guo,

et al. 2024

Materials

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“…Based on these observations, this study aims to evaluate the limitations of using |Z 0.01Hz | (i.e., at 10 mHz, |Z 0.01Hz |) extrapolated from EIS plots for the study of painted steel and hot-dip galvanized steel specimens when subjected to accelerated aging tests such as the continuous neutral salt spray test (NSST) and the cyclic prohesion test. These aging tests are among the most widely used in the industrial field, both for quality control and new product development [44][45][46][47]. Moreover, different corrosion mechanisms could be triggered by the two types of environmental stresses, and the results of the electrochemical reactions may also be different.…”

Section: Introductionmentioning

confidence: 99%

On the Limits of the EIS Low-Frequency Impedance Modulus as a Tool to Describe the Protection Properties of Organic Coatings Exposed to Accelerated Aging Tests

et al. 2023

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This study analyzes the limitations of the low-frequency EIS impedance modulus as a tool to describe the protective properties of organic coatings subjected to accelerated aging tests. Acrylic clear-coated steel and hot-dip galvanized steel were exposed to accelerated test methods such as the neutral salt spray chamber and the Prohesion test for up to 2000 and 3000 h, respectively. During exposure, the protective properties of the coatings were monitored by EIS and visual inspection. We observed a significant discrepancy between the measured impedance modulus in the low frequency range (|Z0.01Hz|), and the actual deterioration of the metal–paint interface. The degradation of the two painted substrates is independent of the accelerated test considered. The |Z0.01Hz| values do not represent the actual degradation state of the metal–polymer interface. The manuscript discusses the reasons for the lack of agreement between EIS and visual inspection. The limitations of using the low-frequency EIS impedance modulus to describe the protective properties of organic coatings are highlighted, and several cautions for interpreting the raw EIS data are suggested. The reliability of possible thresholds of |Z0.01Hz| (e.g., failure below 106 ohm∙cm2) to define the protective performance of the coating turned out to be misleading.

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“…The paint coating of desired color, effect and structure serves to decrease effects of the atmosphere on the zinc. [6] Other application is in medicine, especially in the dentistry. Implants used in treatment are mostly made of titanium and its alloys.…”

Section: Introductionmentioning

confidence: 99%

Tribological Investigation of the Automotive Grade Aluminium Alloy With Epoxy Primer Coating

Kotorcevic

Busarac

Nježić

et al. 2022

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Mechanical surface preparation is a common technique for removing contaminants from surface metal layers. Unlike chemical preparation, it does not require special safety measures, including those for disposal of by-products or toxic materials, thus making it more accessible for different industries. We investigated tribological testing as the experimental method to determine the quality of the coating and the influence of the initial mechanical surface treatment. Samples were made of aluminium alloy EN AW 5083 H111 that was shot blasted with white cast aluminium with resulting surface roughness of Rz=38.908 μm. Samples were further coated with Lankwitzer EvoCor 164 2-component epoxy primer. Tribological test realised on nanotribometer is described and output parameters have been analysed: friction coefficient and penetration depth. Ball-on-flat, dry contact tribological setup was used, with 100 mN normal load, under linear reciprocating motion. Dynamic friction coefficient and penetration depth curves during one tribological test were analysed indicating the moment when the coating exhibited first failure. The test has shown that tribological tests with low loads can be used for quality testing of thin coatings, including the influence of the mechanical surface preparation on the coating adhesion.

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Accelerated Corrosion Tests in Quality Labels for Powder Coatings on Galvanized Steel—Comparison of Requirements and Experimental Evaluation

Cited by 6 publications

References 9 publications

Fatigue Behavior and Fracture Surface Analysis of Corroded High-Strength Bridge Cable Wires

Fatigue Behavior and Fracture Surface Analysis of Corroded High-Strength Bridge Cable Wires

On the Limits of the EIS Low-Frequency Impedance Modulus as a Tool to Describe the Protection Properties of Organic Coatings Exposed to Accelerated Aging Tests

Tribological Investigation of the Automotive Grade Aluminium Alloy With Epoxy Primer Coating

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