Phosphate Passivation Solutions Enhanced by Chemical Additives for Treatment of the Hot Dip Galvanized Steel
To stabilize the surface of the galvanized steel it is important to apply a passivation treatment during its manufacturing. The general aim of the passivation treatment is to prevent the formation “storage stain” or “white rust”. For many decades, the chromium conversion treatments involving the use...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Galati University Press
2011-12-01
|
| Series: | The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science |
| Subjects: | |
| Online Access: | https://www.gup.ugal.ro/ugaljournals/index.php/mms/article/view/2925 |
| _version_ | 1818391465535995904 |
|---|---|
| author | Anișoara CIOCAN Tamara RADU |
| author_facet | Anișoara CIOCAN Tamara RADU |
| author_sort | Anișoara CIOCAN |
| collection | DOAJ |
| description | To stabilize the surface of the galvanized steel it is important to apply a passivation treatment during its manufacturing. The general aim of the passivation treatment is to prevent the formation “storage stain” or “white rust”. For many decades, the chromium conversion treatments involving the use of chromic acid containing Cr6+ species have been used for their corrosion protection and adhesion promotion performances. Today all hexavalent chromates have been banned by the EC. Toxicological studies have evidenced the hazardous character of hexavalent chromium. Therefore more economical and environmentally friendly passivation solutions have been studied and used to replace the chrome passivations on galvanized steel.
Phosphate conversion coatings are commonly used on the galvanized steel. They form a thin protective film on steels surface. However, the formation of a stable and uniform coating for corrosion protection remains a challenge. More complexes passivating solutions with chemical activators added are the potential alternatives.
In this paper are presented the studies about such molybdate–phosphate passivation solutions as environmentally friendly alternative for chromium passivates. The results of treatments realized for different treatment times and more compositions were analyzed. Also the corrosion resistance of the passivated samples has been studied. |
| first_indexed | 2024-12-14T05:13:57Z |
| format | Article |
| id | doaj.art-0d3780c629424828815bb7dd041eda8b |
| institution | Directory Open Access Journal |
| issn | 2668-4748 2668-4756 |
| language | English |
| last_indexed | 2024-12-14T05:13:57Z |
| publishDate | 2011-12-01 |
| publisher | Galati University Press |
| record_format | Article |
| series | The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science |
| spelling | doaj.art-0d3780c629424828815bb7dd041eda8b2022-12-21T23:15:52ZengGalati University PressThe Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science2668-47482668-47562011-12-013442925Phosphate Passivation Solutions Enhanced by Chemical Additives for Treatment of the Hot Dip Galvanized SteelAnișoara CIOCAN0Tamara RADU1"Dunarea de Jos" University of Galati, Romania"Dunarea de Jos" University of Galati, RomaniaTo stabilize the surface of the galvanized steel it is important to apply a passivation treatment during its manufacturing. The general aim of the passivation treatment is to prevent the formation “storage stain” or “white rust”. For many decades, the chromium conversion treatments involving the use of chromic acid containing Cr6+ species have been used for their corrosion protection and adhesion promotion performances. Today all hexavalent chromates have been banned by the EC. Toxicological studies have evidenced the hazardous character of hexavalent chromium. Therefore more economical and environmentally friendly passivation solutions have been studied and used to replace the chrome passivations on galvanized steel. Phosphate conversion coatings are commonly used on the galvanized steel. They form a thin protective film on steels surface. However, the formation of a stable and uniform coating for corrosion protection remains a challenge. More complexes passivating solutions with chemical activators added are the potential alternatives. In this paper are presented the studies about such molybdate–phosphate passivation solutions as environmentally friendly alternative for chromium passivates. The results of treatments realized for different treatment times and more compositions were analyzed. Also the corrosion resistance of the passivated samples has been studied.https://www.gup.ugal.ro/ugaljournals/index.php/mms/article/view/2925hot dip galvanized steelmolybdate–phosphate passivation filmcorrosion resistance |
| spellingShingle | Anișoara CIOCAN Tamara RADU Phosphate Passivation Solutions Enhanced by Chemical Additives for Treatment of the Hot Dip Galvanized Steel The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science hot dip galvanized steel molybdate–phosphate passivation film corrosion resistance |
| title | Phosphate Passivation Solutions Enhanced by Chemical Additives for Treatment of the Hot Dip Galvanized Steel |
| title_full | Phosphate Passivation Solutions Enhanced by Chemical Additives for Treatment of the Hot Dip Galvanized Steel |
| title_fullStr | Phosphate Passivation Solutions Enhanced by Chemical Additives for Treatment of the Hot Dip Galvanized Steel |
| title_full_unstemmed | Phosphate Passivation Solutions Enhanced by Chemical Additives for Treatment of the Hot Dip Galvanized Steel |
| title_short | Phosphate Passivation Solutions Enhanced by Chemical Additives for Treatment of the Hot Dip Galvanized Steel |
| title_sort | phosphate passivation solutions enhanced by chemical additives for treatment of the hot dip galvanized steel |
| topic | hot dip galvanized steel molybdate–phosphate passivation film corrosion resistance |
| url | https://www.gup.ugal.ro/ugaljournals/index.php/mms/article/view/2925 |
| work_keys_str_mv | AT anisoaraciocan phosphatepassivationsolutionsenhancedbychemicaladditivesfortreatmentofthehotdipgalvanizedsteel AT tamararadu phosphatepassivationsolutionsenhancedbychemicaladditivesfortreatmentofthehotdipgalvanizedsteel |