Effect of Oxide Scale Microstructure on Atmospheric Corrosion Behavior of Hot Rolled Steel Strip

Sun, B.Z.; Liu, Cheng; Du, Chongyang; Zhang, Jingke; He, Yu; Cao, Guangming

doi:10.3390/coatings11050517

Cited by 6 publications

(5 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The alternating wet and dry corrosion test was carried out in a spray chamber model F/YW-60 (where the temperature was maintained at 35 °C for 24h, the corrosion spray for 12h and the drying for 12h), and a 0.052% NaHSO 3 (mass fraction) [7]solution was used for the alternating wet and dry corrosion in order to simulate an industrial atmosphere. The physical phase analysis of the rust layer on the surface of the specimens after 240 h of alternating wet and dry corrosion was carried out with the aid of an x-ray diffraction (XRD) analyser (XRD, PANalytical Xpert PRO MPD) using a Cu target with a scanning range of 10°to 90°, a voltage and current of 40 kV and 40 mA respectively, a step size of 0.033°and a scanning speed of 1.…”

Section: Experimental Materials and Methodsmentioning

confidence: 99%

“…Although accelerated indoor corrosion cannot fully simulate the corrosion of materials in a natural environment, the method is still a powerful tool for pre-mouth studies of material corrosion. Sun B et al [7] also found through alternating wet and dry experiments that in the initial stages of corrosion, corrosion products nucleate and form an external rust layer. As the thickness of the outer rust layer increases, corrosion products develop on the defect.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of controlled cooling process on the atmospheric corrosion behaviour of HRB400E hot rolled rebar

Qian¹,

Bao²,

Zhang³

et al. 2022

Mater. Res. Express

View full text Add to dashboard Cite

To address the problem of rusting of reinforcing bars that occurs in industry, the aim is to control the denseness of the iron oxide skin by changing the controlled cooling process without increasing the production cost, thereby improving the corrosion resistance of the bars. In this paper, the effect of different cooling control processes on the industrial atmospheric corrosion behaviour of HRB400E hot-rolled rebar was investigated using alternating wet and dry corrosion tests. The morphology and structure of iron oxide on the surface and cross-section of the rebar were observed using scanning electron microscopy (SEM) and field emission electron probe microanalysis (EPMA); the corrosion products and electrochemical behaviour of the specimens after alternating wet and dry tests were compared using X-ray diffraction analysis (XRD) and electrochemical methods. The results showed that the hot-rolled rebar without controlled cooling had a dense surface, a thicker iron oxide skin and a tighter bond between the iron oxide skin and the substrate; the corrosion rate of the hot-rolled rebar without controlled cooling was less than that of the rebar with controlled cooling in the alternating wet and dry corrosion tests; the corrosion products mainly consisted of α-FeOOH, γ-FeOOH and Fe3O4; the self-corrosion potential and rust layer resistance of the hot rolled rebar without controlled cooling after rolling are higher than those of the controlled cooling bars, showing good corrosion resistance.

show abstract

Section: Experimental Materials and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of controlled cooling process on the atmospheric corrosion behaviour of HRB400E hot rolled rebar

Qian¹,

Bao²,

Zhang³

et al. 2022

Mater. Res. Express

View full text Add to dashboard Cite

show abstract

“…The number of parameters of the network is reduced greatly, and the inference speed of the network speeds up. (3) The AP values of inclusion, patches, rolled-in scale, and scratches are also improved. Finally, the YOLOv7-CBAM greatly enhances the sensitivity of the network to line defects and significantly improves the detection capability of the network for both crazing and scratch defects.…”

Section: Ablation Researchmentioning

confidence: 97%

“…[1]. However, limited by the quality of raw materials, production environment, equipment, manual errors, etc., the strip steel can lead to a variety of problems, the most common one being surface defects [2][3][4]. The surface defects are an important indicator for manufacturers and customers or consumers to judge the quality of strip steel.…”

Section: Introductionmentioning

confidence: 99%

Development of an Improved YOLOv7-Based Model for Detecting Defects on Strip Steel Surfaces

et al. 2023

View full text Add to dashboard Cite

The detection of defects on the surface is of great importance for both the production and the application of strip steel. In order to detect the defects accurately, an improved YOLOv7-based model for detecting strip steel surface defects is developed. To enhances the ability of the model to extract features and identify small features, the ConvNeXt module is introduced to the backbone network structure, and the attention mechanism is embedded in the pooling module. To reduce the size and improves the inference speed of the model, an improved C3 module was used to replace the ELAN module in the head. The experimental results show that, compared with the original models, the mAP of the proposed model reached 82.9% and improved by 6.6%. The proposed model can satisfy the need for accurate detection and identification of strip steel surface defects.

show abstract

“…where h i is the oxide scale thickness corresponding to its specific mass Y i [m]; η sc is the porosity of oxide scale in fractions of one; and ρ sc is its true density [kg•m −3 ]. For furnace scale, formed when heated to 850-980 • C, we assumed η sc = 0.15 [88] and ρ sc = 5500 kg•m −3 [56].…”

Section: Estimation Of Oxide Scale Thickness On the Surface Of The Te...mentioning

confidence: 99%

Validation of the Cooling Model for TMCP Processing of Steel Sheets with Oxide Scale Using Industrial Experiment Data

Beygelzimer¹,

Beygelzimer

2022

JMMP

View full text Add to dashboard Cite

To verify the mathematical model of the water-jet cooling of steel plates developed by the authors, previously performed experimental studies of the temperature of the test plates in a roller-quenching machine (RQM) were used. The calculated temperature change in the metal as it moved in the RQM was compared with the readings of thermocouples installed at the center of the test plate and near its surface. The basis of the model is the dependence of the temperatures of the film, transition and nucleate boiling regimes on the thickness of the oxide scale layer on the cooled surface. It was found that the model correctly accounts for the oxide scale on the sheet surface, the flow rates and combinations of the RQM banks used, the water temperature, and other factors. For all tests, the calculated metal temperature corresponded well with the measured one. In the experiments with interrupted cooling, the calculated temperature plots repeated the characteristic changes in the experimental curves. The main uncertainty in the modeling of cooling over a wide temperature range can be attributed to the random nature of changes in the oxide scale thickness during water cooling. In this regard, the estimated thickness of the oxide scale layer should be considered the main parameter for adapting the sheet temperature-control process. The data obtained confirm the possibility of effective application of the model in the ACS of industrial TMCP (Thermo-Mechanical Controlled Process) systems.

show abstract

Effect of Oxide Scale Microstructure on Atmospheric Corrosion Behavior of Hot Rolled Steel Strip

Cited by 6 publications

References 17 publications

Effect of controlled cooling process on the atmospheric corrosion behaviour of HRB400E hot rolled rebar

Effect of controlled cooling process on the atmospheric corrosion behaviour of HRB400E hot rolled rebar

Development of an Improved YOLOv7-Based Model for Detecting Defects on Strip Steel Surfaces

Validation of the Cooling Model for TMCP Processing of Steel Sheets with Oxide Scale Using Industrial Experiment Data

Contact Info

Product

Resources

About