Formation and growth of manganese phosphate passivation layers for NTC ceramics

Hsing-I Hsiang; Li Then Mei; Yi Hon Lin

doi:10.1016/j.jallcom.2009.05.026

Formation and growth of manganese phosphate passivation layers for NTC ceramics

Hsing-I Hsiang, Li Then Mei, Yi Hon Lin

Department of Resources Engineering

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

This study examines the effect of additives in manganese phosphating (MPO) solution on the formation of phosphate coating and the formation and growth mechanism of phosphates on NTC ceramics using X-ray diffractometry (XRD), scanning electron microscopy (SEM), and electron probe microanalyzer (EPMA). The results showed that addition of Zn²⁺ in MPO solutions can make the coating coverage more complete compared to Fe³⁺. In addition, manganese phosphate precipitation initiated near the grain boundary of Ni-rich region, is generated due to the preferential etching of Mn compared to Ni and Co. The passivation layer formed with manganese phosphate coating has good acid resistance and can act as a passivation layer for NTC during electroplating.

Original language	English
Pages (from-to)	723-728
Number of pages	6
Journal	Journal of Alloys and Compounds
Volume	484
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2009.05.026
Publication status	Published - 2009 Sept 18

All Science Journal Classification (ASJC) codes

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2009.05.026

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title = "Formation and growth of manganese phosphate passivation layers for NTC ceramics",

abstract = "This study examines the effect of additives in manganese phosphating (MPO) solution on the formation of phosphate coating and the formation and growth mechanism of phosphates on NTC ceramics using X-ray diffractometry (XRD), scanning electron microscopy (SEM), and electron probe microanalyzer (EPMA). The results showed that addition of Zn2+ in MPO solutions can make the coating coverage more complete compared to Fe3+. In addition, manganese phosphate precipitation initiated near the grain boundary of Ni-rich region, is generated due to the preferential etching of Mn compared to Ni and Co. The passivation layer formed with manganese phosphate coating has good acid resistance and can act as a passivation layer for NTC during electroplating.",

author = "Hsing-I Hsiang and Mei, {Li Then} and Lin, {Yi Hon}",

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doi = "10.1016/j.jallcom.2009.05.026",

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journal = "Journal of the Less-Common Metals",

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T1 - Formation and growth of manganese phosphate passivation layers for NTC ceramics

AU - Hsiang, Hsing-I

AU - Mei, Li Then

AU - Lin, Yi Hon

PY - 2009/9/18

Y1 - 2009/9/18

N2 - This study examines the effect of additives in manganese phosphating (MPO) solution on the formation of phosphate coating and the formation and growth mechanism of phosphates on NTC ceramics using X-ray diffractometry (XRD), scanning electron microscopy (SEM), and electron probe microanalyzer (EPMA). The results showed that addition of Zn2+ in MPO solutions can make the coating coverage more complete compared to Fe3+. In addition, manganese phosphate precipitation initiated near the grain boundary of Ni-rich region, is generated due to the preferential etching of Mn compared to Ni and Co. The passivation layer formed with manganese phosphate coating has good acid resistance and can act as a passivation layer for NTC during electroplating.

AB - This study examines the effect of additives in manganese phosphating (MPO) solution on the formation of phosphate coating and the formation and growth mechanism of phosphates on NTC ceramics using X-ray diffractometry (XRD), scanning electron microscopy (SEM), and electron probe microanalyzer (EPMA). The results showed that addition of Zn2+ in MPO solutions can make the coating coverage more complete compared to Fe3+. In addition, manganese phosphate precipitation initiated near the grain boundary of Ni-rich region, is generated due to the preferential etching of Mn compared to Ni and Co. The passivation layer formed with manganese phosphate coating has good acid resistance and can act as a passivation layer for NTC during electroplating.

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JO - Journal of the Less-Common Metals

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Formation and growth of manganese phosphate passivation layers for NTC ceramics

Abstract

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