Effect of additives on the properties of phosphate conversion coating on electrogalvanized steel sheet

Su, Hsiang-Yu; Lin, Chao-Sung

doi:10.1016/j.corsci.2014.02.002

Cited by 78 publications

(24 citation statements)

References 42 publications

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“…The coating which is formed on the zinc substrate after hydrothermal treatment is mainly composed of hopeite. The formation can be described as follows:

Zn ─ {Zn}^{2 +} + 2e

{2H}^{+} + 2e ─ H_{2}

H_{2} {PO}_{4}^{-} ─ {HPO}_{4}^{2 -} + H^{+} ─ {PO}_{4}^{3 -} + {2H}^{+}

{Zn}^{2 +} + {2OH}^{-} ─ Zn {(OH)}_{2}

{Zn}^{2 +} + {2PO}_{4}^{3 -} + {4H}_{2} normalO ─ {Zn}_{3} {({PO}_{4})}_{2} \cdot {4H}_{2} normalO ((), hopeite)

…”

Section: Discussionmentioning

confidence: 99%

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Enhanced lubricity of zinc phosphate coating by stearic acid

Zhao

Cao

Wan

et al. 2018

Lubrication Science

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There is a need to reduce the friction and to prevent the galling between the galvanised steel and the shaping tools during the metal working process. Zinc phosphate (ZP) coatings are limitedly used as solid lubricant due to intrinsic high‐friction properties. This investigation explores the use of stearic acid overcoat on ZP coatings to produce surface coatings with low friction and high durability. A simple hydrothermal process was developed to fabricate ZP coatings on zinc. A stearic acid overcoat was then deposited on ZP coatings. Infrared microscopy and water contact angle measurements were used to analyse the chemical composition and the hydrophobicity of modified ZP coatings. The tribological behaviour of modified ZP coatings was evaluated by sliding against a steel ball by using a reciprocating ball‐on‐plate tribotester. Tribological results show that stearic acid overcoat on ZP coatings led to a decreased friction with greatly extended life.

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“…The coating which is formed on the zinc substrate after hydrothermal treatment is mainly composed of hopeite. The formation can be described as follows:

Zn ─ {Zn}^{2 +} + 2e

{2H}^{+} + 2e ─ H_{2}

H_{2} {PO}_{4}^{-} ─ {HPO}_{4}^{2 -} + H^{+} ─ {PO}_{4}^{3 -} + {2H}^{+}

{Zn}^{2 +} + {2OH}^{-} ─ Zn {(OH)}_{2}

{Zn}^{2 +} + {2PO}_{4}^{3 -} + {4H}_{2} normalO ─ {Zn}_{3} {({PO}_{4})}_{2} \cdot {4H}_{2} normalO ((), hopeite)

…”

Section: Discussionmentioning

confidence: 99%

“…The coating which is formed on the zinc substrate after hydrothermal treatment is mainly composed of hopeite. The formation can be described as follows 19,20 :…”

Section: Discussionmentioning

confidence: 99%

Enhanced lubricity of zinc phosphate coating by stearic acid

Zhao

Cao

Wan

et al. 2018

Lubrication Science

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“…The phosphating mechanism of traditional phosphating bath had been widely researched. [23,28] When exposed to phosphate bath, the mild steel was first transformed into iron ions and H2 was released at the initial stage of phosphating process as shown in Equation (1).…”

Section: Mechanism Of Phosphating Processmentioning

confidence: 99%

Polypyrrole Functionalized Graphene Oxide Accelerated Zinc Phosphate Coating under Low-Temperature

Zhu¹,

Liu²,

Wang³

et al. 2020

ES Mater. Manuf.

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Zinc phosphate coating, as an effective and fast anticorrosion technique for the metals, have been developed rapidly in recent years. However, it is still a challenge to synthesize a low energy, environmentally friendly and efficient accelerator through a facile method. Herein, as a new accelerator, polypyrrole (PPy) functionalized graphene oxide (GO-PPy) nanocomposites were prepared by in-situ process to grow PPy film on GO surface, Incorporation of GO-PPy into phosphate baths accelerated the phosphating process of phosphate coating and promoted the nucleation and growth of phosphate crystals, achieving stronger corrosion resistance, which were confirmed by electrochemical measures and morphologies characteristic of the phosphate coating. Additionally, when the concentration of GO-PPy in the phosphate baths reached up 1.2 g/L, the phosphate coating possessed the most compact and uniform phosphate crystals and the best corrosion protection performance. Finally, the special mechanism of the phosphate process was discussed. This work introduces a new, low-energy, facile, environmentally friendly and alternative accelerator for the preparation of phosphate coatings.

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“…These additives have showed a great improvement to the final coating performance. They were also found to reduce the porosity of the phosphate conversion coating [40].…”

Section: Alkaline Stability Of Zinc Phosphate Coatingmentioning

confidence: 99%

Modified Zinc Phosphate Coatings: A Promising Approach to Enhance the Anti-Corrosion Properties of Reinforcing Steel

al-Swaidani¹

2017

MOJCE

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Effect of additives on the properties of phosphate conversion coating on electrogalvanized steel sheet

Cited by 78 publications

References 42 publications

Enhanced lubricity of zinc phosphate coating by stearic acid

Enhanced lubricity of zinc phosphate coating by stearic acid

Polypyrrole Functionalized Graphene Oxide Accelerated Zinc Phosphate Coating under Low-Temperature

Modified Zinc Phosphate Coatings: A Promising Approach to Enhance the Anti-Corrosion Properties of Reinforcing Steel

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