Evaluation of pitting corrosion by dynamic speckle pattern analysis

Pedram, Omid; Jamali, Ramin; Abbasian, Vahid; Rad, Vahideh Farzam; Darafsheh, Arash; Khamedi, Ramin; Poursaeidi, Esmaeil; Moradi, Ali‐Reza

doi:10.1038/s41598-023-35559-w

Cited by 11 publications

(4 citation statements)

References 49 publications

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“…Near the fusion boundary, the Cr eq /Ni eq ratio reaches 2:1 to 3:1, accelerating ferrite formation along the HAZ austenite grain boundary. The formed ferrite limits grain growth and reduces the sensitivity of HAZ to liquefaction cracks 29 .…”

Section: Resultsmentioning

confidence: 99%

Welding-induced corrosion and protective measures for clad rebars in neutral chloride environments

Zhuang,

Lu,

Zeng

et al. 2024

Sci Rep

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Corrosion-resistant steel plays a vital role in marine steel structures. This study developed an SS304/HRB400 stainless-steel-clad rebar for application in a cross-sea bridge in Zhejiang Province. CO2 gas shielded welding was employed in the prefabricated steel structure, with SS304 steel as the welding wire. This study investigated the welding on the corrosion resistance of clad rebars and explored corrosion protection measures for welded joints.The results indicated that refined grains appeared in both stainless steel and carbon steel due to distinct dynamic recrystallization (DRX) during welding. The corrosion resistance, as determined by potentiodynamic polarization curve analysis of the material’s interaction with the solution ranked as follows: clad rebar (polished) > clad rebar welding (CRW) > painting the clad rebar after welding (PCRW) > clad rebar (unpolished) > carbon-steel welding (CSW) > carbon-steel bar > cold spraying zinc after clad rebar welding (ZCRW). However, an accelerated corrosion test with four samples for 600 s with a corrosion current of 0.8 A revealed minimal corrosion damage on zinc-coated surfaces. Hence, welding joints for clad steel structures are considered feasible and must be subject to cold zinc spraying after polishing to enhance their corrosion resistance.

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Section: Resultsmentioning

confidence: 99%

Welding-induced corrosion and protective measures for clad rebars in neutral chloride environments

Zhuang,

Lu,

Zeng

et al. 2024

Sci Rep

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“…This matrix is crucial in our study as it captures dynamic changes in the speckle patterns, reflecting variations in the polarization characteristics of the samples. In THSP, the rows (P) represent the selected points, while the columns (Q) track their intensity fluctuations across each reconstructed Mueller matrix image, indicating changes in intensity along the horizontal axis [4][5][6][7]. The THSP approach is key to deriving a range of numerical results, including but not limited to the co-occurrence matrix (COM), inertia moment, auto-correlation, as well as other significant parameters like contrast, polarimetric parameters, and roughness parameters [8,9].…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, a holistic approach that combines multiple decomposition methods may be required to achieve a more complete grasp of the polarization information. In parallel, dynamic laser speckle analysis has emerged as a burgeoning technique [4][5][6][7]. By analyzing the laser speckle patterns, this approach delivers detailed information about the dynamic properties of a sample, offering a unique perspective on its condition and characteristics.…”

Section: Introductionmentioning

confidence: 99%

Differentiating tumor specimens by polarimetric speckle pattern analysis

Abbasian,

Farzam Rad,

Shamshiripour

et al. 2024

Optical Interactions With Tissue and Cells XXXV

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Definite diagnosis of brain neoplasms has been a challenge of neurosurgery practice especially when open surgery is not feasible to obtain adequate tissue samples for pathological investigation (e.g., for deep-seated tumors or tumors of eloquent areas undergoing biopsies or recurrent cases in patients that are candidates for palliative care). This complexity is exacerbated due to tumor heterogeneity, particularly when relying on limited samples obtained through stereotactic biopsies, which increases the risk of misdiagnosis. Addressing this critical issue, we propose a novel, label-free diagnostic approach by combining the strengths of polarimetry and speckle pattern analysis. This research introduces an innovative method that integrates Mueller matrix polarimetry with dynamic laser speckle analysis, offering a promising avenue for precise differentiation of biomedical samples and tissues. We validate the effectiveness of our technique by calculating the Mueller matrix images of the two various subtypes of brain neoplasms, followed by speckle pattern analysis through both numerical and graphical statistical post-processing. The results indicate considerable discrimination between the tissues, highlighting the potential of this methodology as an easily implementable non-invasive quantitative tool for analyzing extensive cancerous specimens.

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“…However, speckle formation may be considered as an advantageous phenomenon, because it contains valuable statistical information about the sample or process that generates the pattern. This positive feature of speckle pattern has led to the growing field of laser speckle analysis and comes along with numerous applications in life science, industry and technology [28][29][30][31][32][33][34][35] . Additionally, due to that speckle patterns contain bright regions surrounded by a connected network of dark sites, there are lots of local intensity gradients throughout the pattern, each can be considered as an optical trap site.…”

Section: Introductionmentioning

confidence: 99%

Sorting of mesoporous silica derivatives by random optical fields

Sadri,

Jamali,

Khan

et al. 2024

Preprint

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Mesoporous silica particles are promising candidates for drug delivery applications. In this paper, we first synthesize meso-porous silica MCM-41 and its derivative MCM-41GA with anchored glutaraldehyde bridges, and characterize them using a variety of techniques, including nitrogen adsorption/desorption, X-ray diffraction, NMR spectroscopy, scanning electron microscopy, and thermogravimetric analysis. Then, we employ random optical fields to sort mesoporous silica particles. Random optical fields by containing local intensity gradients throughout a wide range of field of view provide an elegant, easy-to-implement, and low-cost variant of multiple optical tweezers, which is known as speckle tweezers (ST). ST, similar to multiple optical tweezers, for manipulation tasks, such as trapping, sorting, and guiding of collection of micro and sub-micro objects in several disciplines including statistical physics, chemistry, microfluidics and material science. We show that ST can restrict, sieve, and sort MCM-41 and MCM-41GA particles. The different interaction of mesoporous silica variations with the applied ST may be attributed to the pre-applied modification and the differences in the porosity structure and distribution. Therefore, the results provide insight into the textural and chemical characteristics of mesoporous materials, contributing to a deeper understanding of their potential applications.

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Evaluation of pitting corrosion by dynamic speckle pattern analysis

Cited by 11 publications

References 49 publications

Welding-induced corrosion and protective measures for clad rebars in neutral chloride environments

Welding-induced corrosion and protective measures for clad rebars in neutral chloride environments

Differentiating tumor specimens by polarimetric speckle pattern analysis

Sorting of mesoporous silica derivatives by random optical fields

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