CHEMETALL LTD - BASF
The new generation of dip coating
The combination of pretreatment and coating
The new technology offers 100 % inside coating with the same layer thickness and significantly improved edge coating like in this example .
The Surface Treatment global business unit of the Coatings division within BASF , operating under the Chemetall brand , has developed an innovative coating technology . It is used successfully by selected customers in the metal finishing sector .
The new generation of dip coating
The combination of pretreatment and coating .
The new technology is a corrosion protection system designed for coating steel . This revolutionary process combines pretreatment and paint in one single step .
In contrast to conventional corrosion protection systems , the technology provides excellent and complete coating on both external and internal surfaces including cut edges . Internal threads are excellently coated with an even layer . Corrosion tests ( field tests ) so far show that creepage from scribe after 504h neutral salt spray testing was not more than 3 mm . Depending on the steel quality also good results after 720h have been reached .
Functionality
This innovative corrosion protection coating works without electricity in the immersion baths . The thickness of the coated layer is approximately 20 µ m . Curing time ranges between 20 to 25 minutes at about 200 degrees Celsius peak metal temperature .
The unique coating technology meets the coaters ’ market expectations including process cost and energy savings . Based on in-field evaluations during the pilot phase , we can assure process stability , bath output and reproducibility .
After a primary degreasing or degreasing / pickling phase , the new anticorrosive coating process takes place by immersing a component in a single tank , where the new coating technology is deposited on the metallic product in about one minute for 20 µ m coating thickness . For the near future it is planned to make the coating also available for galvanized steel .
Savings
Due to the technology ’ s unique formulation of combining pretreatment and paint , multiple process cost savings are achieved .
The process , which is applicable on steel , does not require an electrical current .
Accordingly , electricity costs can be reduced as the cooling of the baths contents is not required and the temperature control of the coating bath is no longer necessary .
Additionally , also the contents of the coating tank only need to be circulated slightly during production . As a result , the process footprint is significantly decreased with fewer baths used , water and electricity consumptions .
Advantages
The major advantage of the new technology is its high capacity of covering edges , such as cut edges and internal surfaces offering 100 % complete coating . In addition , the new coating technology enables the significant reduction in both process costs and energy costs .
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22 FEBRUARY 2022 read online : www . surfaceworld . com