Chrome-free conversion layers on zinc alloy coatings - preliminary tests

被引：0
|
作者：
Winiarski, Juliusz [1 ]
Szczygiel, Bogdan [1 ]
机构：
[1] Wroclaw Univ Technol, Zaklad Inzynierii Powierzchni Katalizy & Korozji, Wroclaw, Poland
来源：
OCHRONA PRZED KOROZJA | 2009年 / 52卷 / 4-5期
关键词：
chromating; conversion coating; corrosion resistance; molybdate; citrate;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Molybdate conversion layers have been obtained on the Zn-Ni alloy electrogal-vanised steel from a solution containing sodium molybdate(VI) and sodium citrate, acidified with phosphoric acid. The layers were deposited at different bath temperatures and different pH values. Chromated samples were used as the reference in order to compare the corrosion resistance properties. The increasing bath's temperature causes decreasing corrosion resistance (bigger corrosion curents, smaller polarisation resistance) in 0,5 M NaCl environment. The best molybdate layers were obtained in temperature 25-40 degrees C. These layers are homogeneous and free of cracks.
引用
收藏
页码：174 / 176
页数：3
相关论文
共 50 条
  • [1] Chrome-free conversion coating process evaluation
    Brezovec, PJ
    SECOND AEROSPACE ENVIRONMENTAL TECHNOLOGY CONFERENCE, 1997, 3349 : 363 - 372
  • [2] Chrome-free surface treatments for magnesium alloy
    Umehara, H
    Takaya, M
    Terauchi, S
    SURFACE & COATINGS TECHNOLOGY, 2003, 169 : 666 - 669
  • [3] Formation of a chrome-free and coloured conversion coating on AA6063 aluminium alloy
    Chen, Tingyi
    Li, Wenfang
    Cai, Jackie
    RSC ADVANCES, 2011, 1 (04): : 607 - 610
  • [4] A chrome-free conversion coating for magnesium-lithium alloy by a phosphate-permanganate solution
    Zhang, Hua
    Yao, Guangchun
    Wang, Shulan
    Liu, Yihan
    Luo, Hongjie
    SURFACE & COATINGS TECHNOLOGY, 2008, 202 (09): : 1825 - 1830
  • [5] Preparation and properties of chrome-free colored Ti/Zr based conversion coating on aluminum alloy
    Yi, AiHua
    Li, WenFang
    Du, Jun
    Mu, SongLin
    APPLIED SURFACE SCIENCE, 2012, 258 (16) : 5960 - 5964
  • [6] A study of the environment-friendly chrome-free chemical conversion coating on 2024 aluminium alloy
    Chen, Dongchu
    Gong, Wenhui
    Huang, Zhuzhou
    Li, Wenfang
    PHYSICAL AND NUMERICAL SIMULATION OF MATERIALS PROCESSING, PTS 1 AND 2, 2008, 575-578 : 864 - +
  • [7] Chrome-free zirconia-based protective coatings for magnesium alloys
    Hamdy, Abdel Salam
    Farahat, M.
    SURFACE & COATINGS TECHNOLOGY, 2010, 204 (16-17): : 2834 - 2840
  • [8] Chrome-free Samarium-based Protective coatings for Magnesium Alloys
    Hou, Legan
    Cui, Xiufang
    Yang, Yuyun
    Lin, Lili
    Xiao, Qiang
    Jin, Guo
    INTERNATIONAL FEDERATION FOR HEAT TREATMENT AND SURFACE ENGINEERING (20TH CONGRESS), 2013, 50 : 261 - 266
  • [9] Chrome-free neodymium-based protective coatings for magnesium alloys
    Jin, Guo
    Yang, Yuyun
    Cui, Xiufang
    Liu, Erbao
    Wang, Zhongyu
    Li, Qingfen
    MATERIALS LETTERS, 2011, 65 (08) : 1145 - 1147
  • [10] Chrome-free single-step in-situ phosphatizing coatings
    Yu, Tao
    Whitten, Mary C.
    Munoz, Carmen L.
    Lin, Chhiu-Tsu
    ACS Symposium Series, 2000, 767 : 43 - 59
12345