Dipped
The standard series DIN 55655 – Electro-dipping paints was introduced only recently, the history of the dip painting is already long. It began as early as 1963 at Ford in the United States, where the first application of dip painting with anodic approach went into operation.
The standard series DIN 55655 – Electro-dipping paints was introduced only recently, the history of the dip painting is already long. It began as early as 1963 at Ford in the United States, where the first application of dip painting with anodic approach went into operation. Since then, it has become indispensable for industry to use „assembly line dipping“ to apply adequate corrosion protection. Be it parts of automobiles, commercial vehicles or even industrial applications such as cooling elements, consumer goods or radiators – everywhere is dipped. The relevance of the procedure is high and therefore the work of the standardization committees, where the relevant standards are developed, is of overriding importance. Seven standard parts were developed in the standardization committees within the last year – eight more will follow. This article summarizes the latest standards in the field of dip painting. Part 7 of DIN 55655 deals with wet film resistance.
A method of determining the electrical wet film resistance of an ETL coating is described. This provides a statement about the deposition behavior of electrocoating paints, that is about layer thickness and layer thickness change, wraparound and possibly Abscheidungsanfälligkeit under defined conditions. DIN 55655-8 specifies a method for the determination of the deposition equivalent of an electrodeposition coating.
This allows a statement about the efficiency of the deposition process. When determining the burn-in loss, part 9 of the series comes into play. It specifies a method for the determination of the mass content of volatile constituents of electrodeposition paints (ETL) during stoving (stoving loss). The assessment of the bath stability of electrodeposition paints is specified in DIN 55655-11, which also sets out the corresponding test methods. DIN 55655-12 describes a method that allows the assessment of the sedimentation of electrodeposition paints on horizontal surfaces. A method for determining the re-dissolution effect of ETL is defined in Part 13 of the series of standards. The draft can currently be read and commented. DIN 55655-14: This part of DIN 55655 specifies a method for determining the deposition behavior of an electrodeposition coating (ETL coating) on different substrates and pretreatments. This draft is currently also released for comment.