Durability of Sprayed WC/Co Coatings in Al-added Zinc Bath.

Tani, Kazumi; Tomita, Tsuneo; Kobayashi, Yoshifumi; Takatani, Yasuyuki; Harada, Yoshio

doi:10.2355/isijinternational.34.822

Cited by 25 publications

(11 citation statements)

References 1 publication

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“…Inclusion of double carbides of g-phase (Co 3 W 3 C and Co 6 W 6 C) in the WC/Co coating is found to be effective to improve the durability, where g-phase reduces free metal Co with high reactivity (Ref [5][6][7][8]. However, surface modifications without adhesion of the molten alloy and dissolution by the alloy are still required by the steel manufacturers to increase the operating time retaining the product quality.…”

Section: Introductionmentioning

confidence: 98%

“…Improvement of hot continuous dipping parts, such as sink rolls and stabilizing rolls, with higher erosion resistance against molten zinc (Zn) and aluminum-zinc (Al-Zn) alloys is one of the key issues in steel manufacturing process (Ref 4). It is considered that rolls coated by Co-based self-fluxing alloy has insufficient durability in spite of relatively longer life compared to the common roll made from stainless cast steel (Ref 5,6).…”

Section: Introductionmentioning

confidence: 99%

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MoB/CoCr Cermet Coatings by HVOF Spraying against Erosion by Molten Al-Zn Alloy

Mizuno¹,

Kitamura²

2007

J Therm Spray Tech

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MoB/CoCr, a novel cermet material for thermal spraying, with high durability in molten alloys has been developed to utilize for aluminum die-casting parts, and for hot continuous dipping rolls in Zn and Al-Zn plating lines. The durability of the MoB/CoCr coatings prepared by high velocity oxy-fuel (HVOF) spraying has been investigated using a molten-metal immersion tester. The tests revealed that the MoB/ CoCr coating has much higher durability without dissolution in the molten Al-45wt.%Zn alloy. Little change of crystal structure, mainly composed of double borides of CoMoB and CoMo 2 B 2 , is observed after the immersion test, suggesting that the double borides have much higher durability. Using undercoat is effective to reduce the influence of large difference in thermal expansion between the MoB/ CoCr topcoat and substrate of stainless steel of AISI 316L, widely used for the hot continuous dipping rolls. Optimized thickness combinations of topcoat and undercoat are necessary to obtain intrinsic performance of low reactive MoB/CoCr against the molten Al-45wt.%Zn alloy.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

MoB/CoCr Cermet Coatings by HVOF Spraying against Erosion by Molten Al-Zn Alloy

Mizuno¹,

Kitamura²

2007

J Therm Spray Tech

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“…Since corrosion resistance is the primary criterion for the pot-hardware materials and each candidate material needs to show good corrosion resistance before other properties being investigated, other properties of the intermetallic materials were not investigated in this article. Corrosion behavior of the pot-hardware materials and coating have been studied; [2][3][4][5] however, many investigators show contrasting liquid zinc immersion results for the same alloys. [3,4,5] For instance, literature [3] concluded that aluminum in the molten zinc bath did not diffuse into the WC-Co coating layer.…”

Section: Introductionmentioning

confidence: 99%

“…Corrosion behavior of the pot-hardware materials and coating have been studied; [2][3][4][5] however, many investigators show contrasting liquid zinc immersion results for the same alloys. [3,4,5] For instance, literature [3] concluded that aluminum in the molten zinc bath did not diffuse into the WC-Co coating layer. However, the results in the literature [4] showed that aluminum diffused as much as zinc diffused into the coating.…”

Section: Introductionmentioning

confidence: 99%

Liquid metal corrosion of 316L, Fe3Al, and FeCrSi in molten Zn-Al baths

Liu

Barbero

et al. 2005

Metall Mater Trans A

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“…[3] In order to prolong the service life of these rolls, many studies have attempted to obtain a better understanding of the corrosion behavior of the hardware materials in a variety of compositional coating baths. [4][5][6][7][8] However, the test conditions and focus of each of the projects have been quite broad, encompassing ferrous alloys, cobalt alloys, coatings, and weld materials. Concurrently, extensive research has been executed to define the equilibrium phase diagrams relevant to galvanizing applications.…”

Section: Introductionmentioning

confidence: 99%

Liquid Metal Corrosion of 316L Stainless Steel, 410 Stainless Steel, and 1015 Carbon Steel in a Molten Zinc Bath

Bright²,

Liu

et al. 2007

Metall Mater Trans A

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Corrosion tests of 1015 low-carbon steel and two stainless steels (410 and 316L) were conducted in a pure zinc bath (99.98 wt pct Zn) in order to better understand the reaction mechanisms that occur during the degradation of submerged hardware at industrial general (batch) galvanizing operations. Through this testing, it was found that, in general, 316L stainless steel showed the best dissolution resistance among these three alloys, while 1015 carbon steel provided a lower solubility than 410 stainless steel. Investigating the failure mechanisms, both metallurgical composition and lattice structure played important roles in the molten metal corrosion behaviors of these alloys. High contents of nickel combined with the influence of chromium improved the resistance to molten zinc corrosion. Moreover, a face-centered-cubic (fcc) structure was more corrosion resistant than body-centered-cubic (bcc) possibly due to the compactness of the atomic structure. Analogously, the body-centered-tetragonal (bct) martensite lattice structure possessed enhanced susceptibility to zinc corrosion as a result of the greater atomic spacing and high strain energy. Finally, an increased bath temperature played an important role in molten metal corrosion by accelerating the dissolution process and changing the nature of intermetallic layers.

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Durability of Sprayed WC/Co Coatings in Al-added Zinc Bath.

Cited by 25 publications

References 1 publication

MoB/CoCr Cermet Coatings by HVOF Spraying against Erosion by Molten Al-Zn Alloy

MoB/CoCr Cermet Coatings by HVOF Spraying against Erosion by Molten Al-Zn Alloy

Liquid metal corrosion of 316L, Fe3Al, and FeCrSi in molten Zn-Al baths

Liquid Metal Corrosion of 316L Stainless Steel, 410 Stainless Steel, and 1015 Carbon Steel in a Molten Zinc Bath

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