AN APPROACH TO THE USE OF RADIOISOTOPES IN SALT SPRAY TESTING

1964 ◽  
Author(s):  
C. G. White ◽  
E. F. Stevenson
Keyword(s):  
Salt Spray ◽  
Salt Spray Testing

Study of Microstructure and Corrosion Resistance of Zinc Electrodeposits before and after Black Chromating

2017 ◽  
Vol 751 ◽  
pp. 119-124
Author(s):  
Kanokwan Saengkiettiyut ◽  
Pranee Rattanawaleedirojn ◽  
Adisak Thueploy ◽  
Jumpot Wanichsampan ◽  
Yuttanant Boonyongmaneerat
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Impedance ◽  
Salt Spray ◽  
Alkaline Electrolyte ◽  
Corrosion Properties ◽  
Electrochemical Testing ◽  
Before And After ◽  
Coat Layer ◽  
Zinc Coatings ◽  
Salt Spray Testing

In this work, microstructure and corrosion properties of zinc electroplated steel before and after black chromating was investigated. The test samples were prepared by electrodeposition process, using a commercially-available alkaline electrolyte. Subsequently, the galvanized samples were applied with a black chromate-based passivation layer and a clear top-coat layer. Their microstructures were examined using X-ray diffractometry and scanning electron microscopy. The corrosion resistance of the samples was assessed with the salt spray test, following the ASTM B117, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization in 5 wt.% NaCl solutions. The study showed that zinc electroplated steels exhibit (110) crystallographic orientation. The passivation and top-coat layers did not affect the microstructure of the zinc layer, and covered uniformly on the zinc layer for all sets of samples. The corrosion resistant results obtained from salt spray testing and electrochemical testing revealed that the microstructure of zinc coatings prepared by using different applied current did not influence on their corrosion resistance markedly. While black passivation followed by top coating provided a significant improvement on corrosion resistance of the coatings.

Selected Bibliography on Salt Spray Testing 1935–1946★

CORROSION ◽  
1948 ◽  
Vol 4 (10) ◽  
pp. 492-504 ◽  
Author(s):  
Lorraine R. Voigt
Keyword(s):  
Salt Spray ◽  
Salt Spray Testing

Two-Step Anodization of AZ91 Magnesium Alloy

2005 ◽  
Vol 488-489 ◽  
pp. 653-656 ◽  
Author(s):  
Rong Fa Zhang ◽  
Da Yong Shan ◽  
En Hou Han
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Salt Spray ◽  
Az91 Magnesium Alloy ◽  
Anodic Coating ◽  
Excellent Corrosion Resistance ◽  
Long Time ◽  
Az91 Magnesium ◽  
Short Time ◽  
Salt Spray Testing

Among four AZ91 samples, two were once anodized and the others were twice anodized in two electrolytic baths. After twice anodization, two coatings coexist on the base metal. Surface morphology showed that for one of twice anodic coatings (sample 2), the second coating only existed on some places and sealed some pores of the first coating after short time on the second anodizing. However, for another twice anodic coating (namely sample 4), the second anodization spent very long time and the coating was thick and loose. Salt spray testing showed that sample 2 had the most excellent corrosion resistance and the reason is discussed.

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