Thermal sprayed aluminium (TSA) coatings are widely used for the protection of steels from aqueous corrosion, including offshore structures and components that are exposed to seawater immersion, tidal and splash zone environments. In this paper, the influence of deposition parameters of aluminium coating on its corrosion properties was studied. For different application parameters of TSA coatings, the thickness, the microstructure and corrosion properties were determined. Determination of thickness was performed according to EN ISO 2064:2000 relating to the definition and determination of the thickness of metallic and other inorganic layers. Microstructure was determined using a Olympus GX50 optical microscope. The corrosion properties of the coatings were compared using an accelerated electrochemical corrosion test method. Electrochemical studies were carried out in accordance with the requirements of ASTM standard G 102 -89. The TSA coating performance was quantified in terms of its corrosion potential and the corrosion rate, which was estimated from Tafel polarisation resistance measurements.

This paper addresses important technical problems related with methodological limitations of welding project methods currently adopted, mostly regarding numerical modelling procedure of welding processes. The progress in high nano-technologies give rise to the same approaches to be applied in traditional mechanics and material science, really concerning welding processes using various methods and techniques.Recent investigations of welded joints have shown the benefits related to the employment of neutron techniques, to obtain substantial information advancing quality and durability that cannot be found by using other means. Small Angle Neutron Scattering (SANS) and Neutron Diffraction (ND), in particular, consent materials characterization at atomic and nanoscale level, offering to the existing technologies the essential contribution of precise structural methods. The basic theoretical aspects are described, and some SANS investigations of weldments are reported.An experimental programme has been recently projected to develop welding processes, with quality assurance improvement, safety enhancement, life-time management and cost effectiveness of the considered joints.

In the present work, the method of response surfaces was employed for the purpose of drawing up a mathematical model for the calculation (forecasting) of the thickness of a flame sprayed coating of powdered aluminium on S235JR steel. Experimental work was conducted according to a full central composite design at three levels. The thickness of the coatings made with combinations of input parameters of the procedure according to the experiment plan mentioned was measured in line with the ISO 2064 standard. A mathematical model was derived describing the dependence of the experimentally obtained thickness values on the input parameters of the procedure. The possibility of analysing the influence of the parameters upon the thickness for a certain combination of input parameters has been presented with the use of perturbation plots.

The application of adhesives in the joining of materials is limited not only by the impossibility of accurately calculating the strength of an adhesive bonded joint, but also by incomplete knowledge of effect of service conditions upon degradation of adhesive forces. This is particularly true for adhesive bonded joints intended for service in sea water. In the introductory part of the paper, the effects of liquids upon the strength of adhesive bonded joints are described as reported in the reference publications. Difficulties encountered in using adhesive bonded joints in liquids and other media with high humidity are considered. In the experimental part of the paper, the authors endeavour to explain the effects of sea water upon the strength of single lap adhesive bonded joints of high alloyed steel.Keywords: adhesive bonding / mathematical model / strength calculation / service conditions / sea water / Neben der Unmöglichkeit der exakten Klebungsfestigkeitsberechnung, ist die Unkenntnis der Adhäsionsschwächung mit der Zeit eine Einschränkung für die Klebtechnikanwendung insbesondere bei der Anwendung unter Meerwasser. In der Einführung dieser Arbeit wird die Auswirkung von Flüssigkeiten auf die Klebfestigkeit nach Literaturangaben beschrieben und es werden die Schwierigkeiten bei der Klebanwendung in Flüssigkeiten und Medien mit großer Feuchtigkeit angezeigt. Im experimentellen Teil der Arbeit wird untersucht wie sich die Meereswassereinwirkung auf die Festigkeit von einschnittig überlappten Klebverbindungen an hochlegierten Stählen auswirkt.