Effect of permanganate concentration on the formation and properties of phosphate/permanganate conversion coating on AZ31 magnesium alloy

Lee, Y.L.; Chu, Yu-Ren; Li, W.C.; Lin, Chao-Sung

doi:10.1016/j.corsci.2013.01.014

Cited by 59 publications

(22 citation statements)

References 44 publications

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“…The results revealed that the Schiff base exhibits an inhibiting effect on the magnesium alloy, which depends on the concentration. The corrosion protection of AZ31 magnesium alloy was also studied by lots of groups using phosphate solutions containing several inorganic salts [12][13][14][15]. The reported results indicated the formation of phosphate conversion coatings on the metal surfaces including elements of the corresponding salts.…”

Section: Introductionmentioning

confidence: 90%

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Evaluation of the protective ability of typical corrosion inhibitors for magnesium alloys towards the Mg ZK30 variant

et al. 2015

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Section: Introductionmentioning

confidence: 90%

“…Zn(OH) 2 + 2OH − → Zn(OH) 4 −2 (12) It is believed that the low corrosion protection properties of zinc hydroxide are attributed to its dissolution in local enhanced concentration of OH − .…”

Section: Corrosion Inhibition Mechanismmentioning

confidence: 99%

Evaluation of the protective ability of typical corrosion inhibitors for magnesium alloys towards the Mg ZK30 variant

et al. 2015

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“…12 b and d). The contents of phosphorus and manganese are very high in the pores; the coating is not worn, and the distribution of the "point" of the phosphate film on the worn surface functionsas oil storage and lubrication to prevent direct contact between the metal surface and adhesion wear [25]. The increase in phosphorus content can gradually smooth the friction surface because of the change in the material microstructure structure caused by phosphorus (appearance of martensite) and the effect on the toughness and hardness of iron-based materials; thus, the shearing properties and adhesion resistance of the matrix material during friction action are improved.…”

Section: Friction Mechanism Analysismentioning

confidence: 99%

Comparative Study on the Friction Property of Bearing Steel Modified Bygraphite/MoS2 Composite Coating and Manganese Phosphate Coating

Zang¹,

Chen²,

Ran³

et al. 2019

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Surface modification is an important method to improve the contact fatigue life of transmission parts. The preparation of high performance coating with good tribological properties on the gears and bearings has become the research trends. This paper presents graphite/MoS2 composite spray and manganese phosphate conversion coating prepared on the AISI52100 steel surface and investigates their anti-fatigue mechanism. The tribological properties of the modified layers were studied using a SRV-IV multifunctional friction and wear tester. The microstructure and interfacial components of the coating and wear surfaces were analyzed by SEM and EDS, respectively. The surface morphology and phase composition of the coating were evaluated through laser 3D microscopy and XRD analyses, respectively. Both modified layers showed good anti-friction and anti-wear properties. The friction coefficients of the surfaces modified by manganese phosphate coating and graphite/MoS2 decreased by 7 % and 14 %, respectively, and the corresponding extreme pressure properties increased by 11 % and 55 %, respectively. But the mechanism of anti-fatigue wear and the corresponding interfacial phenomena of the surface modification of the graphite/MoS2 composite spraying layer is different from those of manganese phosphate coating. The hard-ceramic particles with graphite and MoS2 are sprayed on the substrate to obtain the surface hardening layer, resulting in higher wear resistance. The graphite and MoS2 modified layer can greatly reduce the friction coefficient and improve the lubrication performance on the surface. Manganese phosphate coating serves as a chemical soft coating and is filled with rough corrugated caused by surface processing, which induces an ideal meshing surface after initial friction phase. The obtained hole-shaped structure and "infiltration" role contribute to the storage of lubricants and thus improves the lubrication performance.

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“…Surface treatments are easy and simple for corrosion protection. The chemical conversion treatments applied to magnesium alloys generally use cerate [4][5][6], permanganate [7,8], fluoride [9], phosphate [10][11][12] and stannate [13][14][15] in the baths. Such coatings provide a limited corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Stannate Conversion Coatings For AM60B Magnesium Alloy

Jia¹,

Zhou²,

Shu-yan³

2016

Proceedings of the 2016 International Conference on Advances in Energy, Environment and Chemical Science

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A stannate conversion coating was designed for AM60B magnesium alloys. The influences of temperature and time on the surface morphology and phase composition have been tested using scanning electron microscope (SEM) and X-ray diffraction (XRD), respectively.Additionally,potentiodynamic polarization tests have been used to estimate the corrosion resistance of unprotected and protected AM60B Magnesium alloy with a stannate conversion coating in 3.5% NaCl solutions.Plenty of coating particles form a stannate coating at 80℃ ,consisting of MgSnO 3 •3H 2 O. At different temperature the corrosion potential is nearly the same as-1.31V while with time increase it moves towards to positive and reached to-1.01V .Both of corrosion potentials of stannate conversion coatings are more positive than that of AM60B substrate (-1.48V).

show abstract

Effect of permanganate concentration on the formation and properties of phosphate/permanganate conversion coating on AZ31 magnesium alloy

Cited by 59 publications

References 44 publications

Evaluation of the protective ability of typical corrosion inhibitors for magnesium alloys towards the Mg ZK30 variant

Evaluation of the protective ability of typical corrosion inhibitors for magnesium alloys towards the Mg ZK30 variant

Comparative Study on the Friction Property of Bearing Steel Modified Bygraphite/MoS2 Composite Coating and Manganese Phosphate Coating

Stannate Conversion Coatings For AM60B Magnesium Alloy

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