Corrosion Performance of Laser and Mash-Seam Welded Automotive Sheet Steels

Roudabush, L. A.

doi:10.4271/932363

Cited by 1 publication

(4 citation statements)

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“…It cracks during conventional press forming at room temperature. However, it has a much reduced flaking and powdering property during forming compared to GA coating 58. The high temperature formability of γ Zn–Ni–Fe phases during hot stamping has not been reported during hot stamping.…”

Section: Zn–ni Alloy Coatingmentioning

confidence: 99%

“…Due to its higher hardness, higher melting temperature, and lower coating weight, the weldability of the Zn–Ni alloy coating is generally considered superior to the weldability of GI and GA coatings. The electrode wear is reduced and the welding current range is wider 58. The hot stamped Zn–Ni alloy coating is mostly replaced by a soft α‐Fe phase with Zn and Ni in solid solution.…”

Section: Zn–ni Alloy Coatingmentioning

confidence: 99%

“…It has been reported that the Zn–Ni alloy coating has some paintability problems associated with the application of the electrophoretic primer 58. There is no information available about the paintability of the coating after hot stamping.…”

Section: Zn–ni Alloy Coatingmentioning

confidence: 99%

“…In long‐term and in‐service tests, the fully painted panels with Zn–Ni coating had less cathodic corrosion protection and its corrosion resistance was poorer than that of GI and GA panels. This is due to the gradual decrease of Zn content and increase of the Ni content, in addition to the presence of microcracks in the Zn–Ni intermetallic phase 58. The corrosion resistance of hot stamped Zn–Ni coatings in real service conditions is still not well documented.…”

Section: Zn–ni Alloy Coatingmentioning

confidence: 99%

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State‐of‐the‐Knowledge on Coating Systems for Hot Stamped Parts

Fan

Cooman

2012

steel research int.

175

170

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In the present contribution, recent developments of coatings for hot stamped steels are reviewed. The use of bare steel in the initial hot stamping technology is discussed, including the application of lubricant oils which are used as oxidation inhibitors on bare steel surfaces. The aluminized coatings are introduced, focusing on the microstructure evolution of aluminized coatings during the hot stamping process. An analysis of the cracking of the coating, caused by the formation of brittle Fe-Al intermetallic phases and their high temperature deformation, is presented. The development of a ductile aluminide coating formed during the diffusion treatment of an aluminized coating is discussed. This aluminide coating can endure both high temperature oxidation and severe plastic deformation. The recently developed galvanized and galvannealed coatings are also reviewed and the influence of the gas atmosphere during the heating cycle on the coating stability is emphasized. The solutions which have been proposed to avoid liquid Zninduced embrittlement are analyzed. The use of Zn-Ni alloy coating, which is characterized by a higher melting temperature, is reviewed. The behavior of sol-gel hybrid coatings on hot stamped steels is discussed. The possible use of the recently developed Al-Zn alloy coatings, dual layer Zn-Al and Zn-Al-Mg coatings is also introduced. The application of Zn-Al-Mg post-process galvanizing is also discussed. In each case, all available information related to the weldability, paintability, and corrosion resistance of the coating systems is also reported. Finally, the advantages and technical challenges associated with each type of coating are reviewed.[ Ã ] Dr.

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Section: Zn–ni Alloy Coatingmentioning

confidence: 99%

Section: Zn–ni Alloy Coatingmentioning

confidence: 99%

Section: Zn–ni Alloy Coatingmentioning

confidence: 99%

Section: Zn–ni Alloy Coatingmentioning

confidence: 99%

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