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2 Journal of KONES

2 2010

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Corrosion of Ni-5 percent Al AND Ni-5 percent Al-Al2O3 flame sprayed coatings of "CastoDyn 8000" torch in 0.01 M H2SO4 and 3.5 percent NaCl solutions

Starosta R., Czoska P.

Journal of KONES

2010

Vol. 17, No. 4

471-476

One of methods of regenerating parts of machines is flame thermal spraying, which can be used by ship engine room crew. This method does not require great skill of the operator and is not associated with expensive workstation equipment. Flame sprayed coatings are characterized bv porosity and the presence of oxide inclusions. The presence of pores affects negatively on the corrosion properties of coatings. There is a corrosive environment which may be passed thmugh the pores of the coating to the substrate. This phenomenon is especially dangerous in case of applying cathodic coatings (copper, copper alloys and nickel alloys). The substrate corrosion may then proceed below coating. In the paper researches results of corrosion properties of Ni-Al alloy and Ni-Al-Al2O3 composite coatings were presented. Coatings were obtained by flame spraying of "Casto-Dyn 8000" torch. The studies in 0.01 M H2SO4 and 3.5 NaCl (artificial sea water) environments were realized. Measurements were made following methods: polarization and impedance spectroscopy. Rated coatings are more resistant to the 3.5% NaCl environment than the 0.01 M H2SO4. Corrosion current density for alloy coatings in artificial seawater was 7 miA/cm2 and 232 miA/cm2 environment acidic. Impedance spectroscopy studies showed that the alloy coatings are characterized by more than four times greater resistance in sodium chloride solution than in sulphuric acid solution. Curves flattened in the Nyquist plots may indicate that the appearance of products of corrosion coatings in the pores of the samples during exposure to sea water substitute. The value of corrosion potential in an environment of 3.5% NaCl is about 200 mV lower than 0.01 MH2SO4. Composite coatings Ni-Al-Al2O3 were characterized by a lower corrosion current densities and increased resistance than Ni-Al coatings. This is connected with the operation of non-conducting barrier electrim particles of alumina.

Concept of multifunctional small cleanup ship

Otremba Z., Kończewicz W., Czoska P., Krużycki P.

Journal of KONES

2010

Vol. 17, No. 3

341-345

The Baltic Sea belongs to a global system of protected area and has a status of Particularly Sensitive Sea Area (PSSA) which results in a mechanism for strict control on International shipping activities within designated areas through the UN International Maritime Organization (IMO). Countries can declare such areas, and then establish rules for their protection. Additionaly almost the entire Polish coastline has been notified to the European Natura 2000 sites. Inside coastal NATURA 2000 areas some places are covered by increased protection because of belonging to a system of coastal and marine Baltic Sea Protected Areas (HELCOM BSPA). On the other hand intensive shiping in the vicinity of the Polish coast, high population density in the coast, tourism as well as coastal and marine industry necessitate special attention in relation to environment protection. Therefore, inter alia, novel techniques for the surveillance of purity of coast and coastal water are desirable. In the case of large spill - existing combating system provides only partly reducing ofamount of oil entering the sea environment. Elimination ofa greatest number of small oil spillages or discharges is possible, if well developed techniques and organization systems is used. The paper presents pre-project assumptions for small multifunctional ship designed for inshore activity — especially for port inspections and service, as well as for removal of floating and submerged rubbish and combating small oil spillages. We have analyzed possibility to achieve expected exploitive features of the ship using present knowledge for construction of small ship hulls applying principles of engine and navigational equipment steeringfor choosing the best route and for optimization the water surface cleaning-works as well as to minimize the energy consumption. We expect, that this ship - owing to main designations thanks to modern technical equipment and sophisticated software -will also fulfill conditions as an educational or as a training vessel.