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The Factors Governing Corrosion Stiction of Brake Friction Materials to a Gray Cast Iron Disc

Hyundai Mobis-Wangyu Lee, Dooyeon Kim, Keeyang Lee
Korea Univ.-Jaehyun Gweon, Sanghee Shin, Ho Jang
Published 2018-10-05 by SAE International in United States
Corrosion stiction at the contact interface between a brake friction material and a gray iron disc under the parking brake condition was investigated by evaluating the possible parameters that affect the shear force to detach the corroded interface. Using production brake friction materials, comprising non-steel and low-steel types, corrosion tests were carried out by pressing the brake pad onto the gray iron disc using a clamp at various conditions. Results showed that the shear force to detach the corroded interface tended to increase with applied pressure and corrosion time. On the other hand, porosity, acidity, and hydrophobicity of the friction material did not show a reliable correlation to the stiction force. The poor correlation of the stiction force with the friction material properties indicated that the stiction force was not determined by a single factor but governed by multiple parameters including surface contact areas and inhomogeneity of the ingredients. Microscopic observation of the detached disc surface showed adhered fragments that were removed from the friction material surface, thus shedding light on the possible estimation of…
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Development of Color Coating Anticorrosion Surface Treatment for Brake Parts

Hyundai Mobis-Deukkyu Hwang, Keeyang Lee, Yong Chun
  • Technical Paper
  • 2010-08-0072
Published 2010-05-19 by Society of Automotive Engineers of Japan in Japan
The color surface treatment technology for calipers was developed using aluminum-zinc duplex coating and special color painting. To achieve better impact, oil and corrosion resistance, we have studied the properties by changing coating conditions of aluminum-zinc coating thickness, painting thickness and components of base coating. In addition, we tried to establish optimum coating process conditions by experiment design, finally the prototype of caliper was synthesized by using pilot coating line. For evaluation of coated caliper body and torque member, we have carried out impact test and corrosion test, acid resistance test, etc. The results were considerable for our specification.
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Development of Coating-Geomet Anticorrosion Surface Treatment for Brake Parts

Hyundai Mobis-Deukkyu Hwang, Keeyang Lee, Daeup Kim
  • Technical Paper
  • 2009-08-0041
Published 2009-05-20 by Society of Automotive Engineers of Japan in Japan
The anticorrosion black surface treatment technology was developed by using aluminum-zinc duplex coating and special black painting. To achieve better impact, oil and corrosion resistance, we have studied the properties by changing coating conditions of aluminum-zinc coating thickness, black painting thickness and components of black painting. In addition, we tried to establish optimum coating process conditions by experiment design, finally the prototype of caliper was synthesized by using pilot coating line. For evaluation of coated caliper body and torque member, we have carried out impact test and corrosion test, oil resistance test, etc. The results were considerable for our specification.