Passivation and Chemical Conversion Combined Multi-Elements Coating on Low Sn-Coated Steel for Corrosion Protection

Zhao, Yinghai; Yin, Xuefeng; Shen, Pengjie; Li, Ning; Xu, Yanling

doi:10.1149/1945-7111/ac7efa

Cited by 4 publications

(2 citation statements)

References 41 publications

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“…5 Recent years have seen rapid progress in the development of low-Sn layer tinplate strip steel and chromium-free passivation technologies, driven by the shift towards green and low-carbon initiatives. 6,7 The surface rust resistance of tinplate is particularly vital for the preservation of canned food. As demonstrated in Figure 1(c), the tinplate undergoes processes like electroplating, reflowing, passivation and oiling, resulting in the formation of tin, Sn–Fe alloy, oxide film, passivation film and oil film layers, substantially enhancing its rust resistance.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of surface rust defects on tinplate strip steel during storage and transportation

Zhang,

Bai,

Ran

et al. 2024

Ironmaking & Steelmaking: Processes, Products and Applicati

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This study elucidates the rusting mechanism on tinplate during storage and transportation. It was found that the absence of a Sn layer on the sheared edges, combined with a thinner Sn layer in the centre compared to the edges, leads to increased ATC values and porosity at the centre. Consequently, this results in diminished rust resistance at both the sheared edges and central regions. Simulations of storage and transportation conditions, along with electroplating experiments, demonstrated that waviness in the tinplated substrate contributes to higher porosity and reduced thickness of the Sn–Fe alloy layers in both electroplating and reflowing processes. Moreover, the choice of electroplating processes significantly influences the rust resistance of tin-plated plates. The adherence of rust factors during the tinplating process, particularly when subjected to condensation during storage and transportation, exacerbates the rust of tinplate.

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Section: Introductionmentioning

confidence: 99%

Mechanism of surface rust defects on tinplate strip steel during storage and transportation

Zhang,

Bai,

Ran

et al. 2024

Ironmaking & Steelmaking: Processes, Products and Applicati

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“…Previous studies have utilized various analytical techniques to investigate the surface layer of commercial tinplate [6][7][8][9][10] . For instance, in addition to the XPS method with argon ion sputtering used by Chen et al [11] , Sun et al [12] , and Azzerri et al [13] , other studies have employed techniques such as Raman spectroscopy [14] , atomic force microscopy [15] , and X-ray diffraction [16] to analyze the surface composition and structure of tinplate.…”

Section: Introductionmentioning

confidence: 99%

Examination of surface contamination and impurities in tinplate samples, both passivated and non-passivated

Meysami,

Amini Najafabadi,

Nemati Varnoosfaderani

et al. 2023

Mater. Tech. Rep.

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This study examined the surfaces of non-passivated and passivated tinplate samples, as well as the impurities present on them, using SEM, EDS, and GDOES. Additionally, solutions were analyzed using ICP in order to identify any correlations between the elements present in the solutions and on the strip surfaces. The results from GDOES indicated the presence of unwanted elements, such as Sn, S, Cr, N, P, Zn, Fe, Mn, C, and Si, on both the passivated and non-passivated sample surfaces. SEM analysis of the passivated sample revealed light and dark regions in parallel lines, which were observed ahead of the rolling direction. EDS analysis indicated that the light areas were rich in Sn while the dark areas were rich in Fe, and C was identified as an unwanted element in both areas. O and Cr were only found in the dark areas. EDS analysis of the impurities revealed Na, S, Cl, Ca, Mg, Si, N, and Al as unwanted elements. The results suggest that unwanted elements are transferred from the steel strip surface to different solutions in the tinplate line, causing pollution in various solutions.

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Optimization of Mn-Al-P Chemical Conversion Coating for a Process Sequence Adjusted Low Sn-Coated Steel

Zhao

Li²,

Wang

et al. 2023

Corrosion

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In recent years, in the field of tinplate production, it has become a trend to use lower tin coating mass to lower production cost. However, the preparation of low Sn-coated steel must face two significant problems: toxic chromate post-treatment and low corrosion resistance. In this work, we developed a Mn-Al-P chemical conversion coating using for process sequence adjusted tinplate of 0.5g·m<sup>-2</sup> tin coating mass to alternative the chromate treatment. Meanwhile, by adjusting the subsequence of the reflowing process and the post-treatment process, the wash water and electricity consumption was effectively reduced. The influence of reflowing time on the microstructural appearance, phase composition, surface element distribution, and corrosion resistance of this new brand tinplate was studied. Moreover, the composition was determined by XPS, and further discuss the formation mechanism of this coating. The results show that this muti-element coating could effectively fill tin-free zones on the surface of tinplate and improve the corrosion resistance when the reflowing time is properly setup to 3.5 s after the process adjustment. However, continually extended the reflowing time would cause the phosphate coating to fall off, which lead to the corrosion resistance deteriorate. The coating was mainly made up by a series of amorphous phosphate compounds and metal oxides, which was suitable for tinplate with low tin coating mass.

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Passivation and Chemical Conversion Combined Multi-Elements Coating on Low Sn-Coated Steel for Corrosion Protection

Cited by 4 publications

References 41 publications

Mechanism of surface rust defects on tinplate strip steel during storage and transportation

Mechanism of surface rust defects on tinplate strip steel during storage and transportation

Examination of surface contamination and impurities in tinplate samples, both passivated and non-passivated

Optimization of Mn-Al-P Chemical Conversion Coating for a Process Sequence Adjusted Low Sn-Coated Steel

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