Laboratories in the Chemical Engineering degree programme

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How is the coating applied to the workpiece? Under which conditions do we achieve the desired optical and technological properties of the coating layer? How can we design our methods and processes so as to minimise the negative effects on the environment and decrease our operating costs at the same time?

These are questions which are answered in the Application Technology Laboratory through the practical utilisation of different application methods. We get to know the most important methods of paint application and obtain a first impression of how we can decisively improve the quality of the paint layer by optimising the application parameters.

An important aspect here is the correct practical handling of the various measurement methods to assess the optical and technical properties of the paint layer. This includes hue, brilliance and roughness as well as hardness, scratch resistance or elasticity.

Application techniques such as dip and spray coating or electrostatic power coating are considered. Manual systems as well as automated equipment with robot support are used here. Some of the laboratory work also involves looking at the drying process.

 

Head of Laboratory:    Prof.Dr. Joachim Domnick
Assistant:                      B.Sc. Stefan Schacht
 

Laboratory:                     S 10.208, S 10.210

Laboratory phone:                  -3517, -3518

         

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How can the corrosion resistance of metals or the effectiveness of corrosion-protection measures be assessed in practice? How do you select effective corrosion-protection measures? On the “Corrosion protection” practical laboratory course, participants learn the most important experimental methods and evaluation procedures to answer these questions, e. g.

  • Accelerated weathering tests such as salt spraying, condensed water test and cyclic testing methods
  • Galvanostatic/potentiostatic measurement of current-voltage curves
  • Impedance spectroscopy
  • Scanning Kelvin probe
  • Metallography
  • Electron microscopy

and use them to assess the following aspects:

  • Measurement of corrosion potential and corrosion speed
  • Assessment of the passivity of metals 
  • Resistance against pitting corrosion 
  • Effectiveness and mechanisms of corrosion-protection inhibitors 
  • Investigation of the structure and effectiveness of conversion layers 
  • Investigation of the corrosion-protection effect of coatings 
  • Investigation of the failure of corrosion-protection coatings as a result of blistering, cathodic delamination and filiform (underfilm or filametary) corrosion 
  • Comparative assessment of corrosion-protection coatings 
  • Ascertaining why damage has occurred

On the “Building Protection” practical laboratory course, participants carry out model experiments to understand building material degradation on the one hand, e. g.

  • Morphology and chemical composition of building materials
  • Water transport in building materials
  • Water vapour diffusion
  • Sorption isotherms
  • Salinity and impact of hygroscopic impurities on the water balance
  • Strength profile and moisture distribution

and also perform investigations to assess building protection measures, such as

  • Influence of coatings, hydrophobisation and other surface treatments on water and water vapour permeability
  • Destructive and non-destructive measurement of the moisture content of building materials
  • Assessment of the salinity of building materials
  • Reinforced concrete: Assessment of carbonation depth, corrosion of concrete-reinforcing steel (also non-destructively) and surface hardness
  • Non-destructive acquisition of strength profiles and assessment of stone consolidation measures
  • Assessment and selection of coatings in constructional steelwork
  • Assessment and selection of coatings in building preservation
  • Damage analysis on a residential building

 

Head of Laboratory:       Prof. Dr. Renate Lobnig

Laboratory:                         S 10.201, S 10.211, S 10.213

Laboratory phone:                -3516, -3519, -3521

 

             

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The  Design component offers a foundation course on the theory of colours and shapes as a 4-hour compulsory lecture. It also offers compulsory electives and main courses on colour design as a 2-hour lecture; Creative Techniques as a 4-hour practical - workshop block; product design/colour as a full-day seminar of 8 SWS (theory and practice); technical and freehand drawing as a 2-hour seminar; and heritage protection as a 4-hour seminar.

Taking the teachings of the Bauhaus movement as their basis, the first lectures on the theory of colours and shapes discuss topics such as the theory of shapes according to Kerner Duroy, Johannes Itten and Wassily Kandinsky. Particular emphasis is placed on the chapter about the theory of colour. The main focus is on the theories of Goethe, Itten and other Bauhaus instructors.

In the lectures on colour design, issues of current colour design as well as product and object design, advertising and typography are addressed. Key elements are topics such as colour and its symbolism, its effect on people’s well-being, colour and health, as well as colour in printing and media techniques.

Creative techniques offers a workplace to practise and experiment with “colour as a creative means of expression” in the spirit of the Bauhaus teachings. The field of work is defined as the interface between “free and applied art”. According to Walter Gropius, art cannot be taught or learned, but good craftsmanship can. In free exercises on the topic of point, line and plane, a large variety of tools are used to work in black-and-white or colour.

The topics of applied colour design - architectural design and object design - are discussed in the Product design/colour course. 
Students practise how to critically handle colours and colour valences. Some parts of object design (e. g. typography/typeface) are undertaken on the practical level; possible visits to exhibitions, with a special emphasis on the topic of colour, complete the seminar.

Technical and free drawing is offered so students can learn how to read machine drawings. The focus here is on investigating the relationship between the 2 and 3-dimensional representation of simple objects or mechanical engineering parts. The course covers multi-view projection, and also includes the different parallel perspective representations as well as the (one-point) perspective drawing of objects with various vanishing points.

 

Head of Laboratory:  Prof. Klaus Friesch
Assistants:                  B.Sc. Vanessa Staudt
 

Laboratory:                    S 1.-131

Laboratory phone:        -3535           
              

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Students are set tasks of greater or lesser complexity, which they have to solve on their own in order to achieve a goal. i.e. they learn to develop paint formulations. The paints are then produced with different types of dispersing apparatus (Fig. 1, left).

The paints thus obtained are applied to appropriate surfaces (Fig. 2, centre) and dried or cured.

After testing the coatings, the students learn, for example, that the gloss and flexibility of the coatings decrease significantly with increasing pigmentation. They thus learn how the coating properties depend on the constituents of the paints (formulation/ingredients). In another case, they observe that pigments separate (Fig. 3, right); this damage pattern can be removed by adding a suitable silicone additive. The students thus become familiar with the effects of paint additives.

 

Head of Laboratory:   Prof. Dr. Markus Schackmann
Assistants:                    Dipl.-Ing.(FH) Christine Kunert
 

Laboratory:                    S 10.219

Laboratory phone:       -3524

          

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In the Surface and Nano-chemistry Laboratory, the equipment necessary for the preparation and characterisation of specific surfaces is available. The focus here is on the chemical modification of the surfaces and their structuring on the nanometre scale. The objective of the laboratory course within this framework is to show the students the interaction between the chemistry, structure and function of the surface. This is illustrated by way of an example:

The silanisation of silicon dioxide surfaces involves the application of a molecular film of alkoxysilane molecules to the surface. The way they form and thus the quality of the films obtained can be controlled via the reaction parameters, as is examined with the aid of wetting angle measurements. When the surface is structured, too, the wetting angle can be increased again for the same level of silanisation compared to the smooth surface.

Further experiments deal with, among other things,

thiolation, superhydrophobic layers, antireflective coatings, photocatalytic boundary layers, electrochemical double layers

The following experimental techniques are used here

Dip coating, spin coating, silk-screen printing, hydrothermal synthesis, UV-Vis spectrometry, wetting angle measurements, zeta potential measurements

The research activities in the Surface and Nano-chemistry Laboratory include:

  • Sorption equilibria of ions and polymers 
  • Electrokinetic powder characterisation
  • Boundary surface properties in dispersions

 

Head of Laboratory:       Prof. Dr. Stephan Appel
Assistants:                         B.Sc. Stefan Schacht
 

Laboratory:                          S 13.-113

Laboratory phone:                -3246

          

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This laboratory teaches the students about polymer materials from their chemical composition and materials testing through to the production and post-processing of finished parts. The practical work focuses on getting to know the different material, processing technology and external factors which affect the material properties. Other specialisations are plastics processing and coating. Students have the opportunity to pretreat plastic parts themselves, to paint them and test the polymer-paint bond.

The laboratory on organic binding agents and pigments teaches students how to produce different binding agents and pigments themselves and to test them for specific criteria. Special emphasis is placed on the production of environmentally friendly binding agents. The binding agents and pigments produced undergo a physical characterisation and are subjected to application-related tests. The drying/hardening characteristics of binders and the tinctorial strength, for example, of pigments are tested.

 

Head of Laboratory:  Prof. Dr. Guido Wilke
Assistants:                   Dipl.-Ing. Karin Bertleff
 

Laboratory:                            S 10.206, S 10.207

Laboratory phone:                -3510, -3511

          

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In the Materials Testing Coatings Laboratory, students learn about fundamental tests in coating technology. This is done using simple self-produced and commercially available paints, printing inks and other coating materials and coatings.

Investigations of coating technology parameters which determine the process capability of paints not only form part of the laboratory experiments, but are also worked on in the form of exercises in the seminar.

The programme includes for example mechanical engineering tests such as layer thickness measurement, hardness, elasticity, flexibility, scratch and abrasion resistance.

Colour and gloss - the appearance of coatings is assessed visually and by means of methods such as gloss measurement with reflectometers, haze meters, goniophotometers and colour metrics.

Rheometry plays an important role in the laboratory and can be performed on three rheometers (two with gas bearings)

  • on paints and other coating substances
  • as used in paint development and quality control

The resistance of paints and printing inks against weathering and against chemicals, environmental chemicals, foodstuffs etc. is investigated using conventional methods (left microscopic image of the damage to a coating layer caused by the effect of a solvent droplet)

 

Head of Laboratory:  Prof. Dr. Georg Meichsner
Assistants:                   Dipl.-Ing. Karin Bertleff
 

Laboratory:                      S 10.205

Laboratory phone:                - 3509

           

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