Perforation Corrosion Performance of Autobody Steel Sheet in On-Vehicle and Accelerated Tests

Davidson, D. Donald; Thompson, L. S.; Lutze, Frank W.; Tiburcio, Butch; Smith, Kevin A.; Meade, Cindy; Mackie, Tom; McCune, Duncan; Townsend, Herb; Tuszynski, Rebecca

doi:10.4271/2003-01-1238

Cited by 7 publications

(4 citation statements)

References 6 publications

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“…[32][33][34][35] Perforation corrosion, which occurs at lapped portions and is still a major corrosion issue in the automotive industry, is discussed. [36][37][38] Perforation corrosion of corroded vehicles used in different regions and test specimens tested by various CCT were quantitatively investigated. The corrosion resistance of zinc and zinc alloy coated steels was compared under different CCT conditions and use environments.…”

Section: Introductionmentioning

confidence: 99%

Automotive Corrosion and Accelerated Corrosion Tests for Zinc Coated Steels

Mizuno¹

2018

ISIJ International

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Numerous studies on zinc and zinc alloy coated steel sheets have appeared since corrosion problems were widely recognized in the automotive industry in the 1970s. In general, accelerated corrosion tests including the Salt Spray Test and Cyclic Corrosion Tests have been applied to evaluate the corrosion resistance of coated steels in the laboratory in order to shorten the product development period. However, the reproducibility of corrosion in actual use conditions by corrosion tests is always a controversial issue. In this paper, author's previous studies regarding corrosion of coated steel sheets in automobiles and corrosion tests are reviewed. The perforation corrosion behaviors of coated steels at lapped parts in snowy and tropical regions were clarified on the basis of an analysis of corroded vehicles. Several types of accelerated corrosion tests used in the automotive industry were conducted for comparison with the corrosion observed in the actual vehicles. The Perforation Corrosion Index (PCI), which is the corrosion rate ratio of steel and zinc coating, was introduced as an index for comparing the correlation of corrosion behaviors. Coating weight is the major factor determining the perforation corrosion resistance of existing coated materials in automobile use environments. Corrosion tests that have a PCI value close to that in the use environment can simulate similar corrosion tendencies. The influence of the specimen configuration is also a key factor for adequate evaluation of corrosion resistance. Specimens without an intentional large clearance and bare metal surface in the lapped portion are recommended for perforation corrosion tests.

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Section: Introductionmentioning

confidence: 99%

Automotive Corrosion and Accelerated Corrosion Tests for Zinc Coated Steels

Mizuno¹

2018

ISIJ International

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“…A typical example of the atmospheric corrosion behavior of automotive parts is the corrosion caused by deicing salts. [55][56][57] It has been demonstrated by both field and accelerated tests that such corrosion causes extensive deterioration of components. [58,59] During the metal's corrosion and hydrolysis, the atmospheric pH value and corrosion potential continuously decrease, promoting the external hydrogen entry.…”

Section: Hydrogen Ingressmentioning

confidence: 99%

Hydrogen Embrittlement Evaluation and Prediction in Press‐Hardened Steels

Cao

Wang

Ngiam

et al. 2023

steel research int.

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The application of press-hardened steels (PHSs) in automotive body-in-white components using the hot-stamping technique is growing thanks to its impressive strength and formability. Unfortunately, hydrogen embrittlement (HE), an issue that generally exists in high-strength steels, impedes the PHSs rising application trend by causing catastrophic mechanical property degradation. Thus, detailed evaluation and prediction of HE risk throughout PHSs manufacture and service condition are necessary. This study highlights techniques to characterize the hydrogen content and distribution, techniques to evaluate HE susceptibility, and potential models to simulate the in-service performance of PHS. The survey of existing studies has revealed the gaps between laboratory measurement and industry application, including but not limited to 1) the accelerated experiment-induced discrepancies against real-life applications, 2) a selection of the appropriate HE indicators, 3) an accurate risk prediction model, and 4) efficient feedback to the industry based on both experimental and simulated results. Based on the review, future studies are expected to establish a conclusive HE evaluation standard for PHS.

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“…Two questions, whether the production process of press-hardened steels (cold-rolled and CSP hot-rolled) affects the corrosion resistance of press-hardened parts (uncoated) and whether press-hardened Al–Si coatings have cathodic protection, were effectively answered. In this study, the levels of corrosion resistance of press-hardened sheets using cold-rolled and CSP hot-rolled press-hardened steels were also compared by means of electrochemical measurement and laboratory accelerated corrosion tests [ 32 , 33 ]. Given the distinct variations in the inclusion composition and surface roughness between the two uncoated steels, it was imperative to assess the feasibility of substituting cold strips with CSP hot strips for press-hardened steel production in terms of safety.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Anti-Corrosion Properties of Different Types of Press-Hardened Steels

Peng,

Zhao,

et al. 2024

Materials

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Hot stamping (or press hardening) is a new technology that is widely used in the production of advanced high-strength steel parts for automotive applications. Electrochemical measurements, including potentiodynamic polarization and electrochemical impedance spectroscopy (EIS), and accelerated corrosion tests (the neutral salt spray test and periodic immersion test) were conducted on press-hardened samples produced from uncoated (cold-rolled and cold strip production (CSP) hot-rolled) and Al–Si-coated press-hardened steels to elucidate their distinct anti-corrosion mechanisms. The cross-sectional micromorphology and element distribution of three types of press-hardened steels after a neutral salt spray test were observed using scanning electron microscopy (SEM) and energy-dispersive X-ray analysis (EDAX). The corrosion resistance of Al–Si-coated press-hardened steel was found to be significantly diminished following the hot stamping process due to the presence of microcracks and elevated iron content in the coating subsequent to austenitizing heat treatment. On the other hand, the corrosion resistance of uncoated press-hardened sheets produced from cold-rolled and CSP hot-rolled press-hardened steel was found to be proximal due to their nearly identical composition and microstructure (fully martensite) after the hot stamping process. Considering the high efficiency and energy-saving properties of hot-rolled press-hardened steel, it holds the potential to replace cold-rolled and even aluminum–silicon-coated press-hardened steel in automobile manufacturing.

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Perforation Corrosion Performance of Autobody Steel Sheet in On-Vehicle and Accelerated Tests

Cited by 7 publications

References 6 publications

Automotive Corrosion and Accelerated Corrosion Tests for Zinc Coated Steels

Automotive Corrosion and Accelerated Corrosion Tests for Zinc Coated Steels

Hydrogen Embrittlement Evaluation and Prediction in Press‐Hardened Steels

Comparative Study of Anti-Corrosion Properties of Different Types of Press-Hardened Steels

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