SVIBOR - Project code: 1-07-032


Strossmayerov trg 4, HR - 10000 ZAGREB
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Project code: 1-07-032


Main researcher: ŠARC-LAHODNY, OLGA (46003)

Type of research: applied
Duration from: 01/01/91. to 01/01/95.

Papers on project (total): 1
Institution name: Rudarsko geološko naftni fakultet, Zagreb (195)
Department/Institute: Mining, Geology and Petroleum Engineering Faculty of the Univers ity of Zagreb,
Address: Pierottijeva 6
City: 10000 - Zagreb, Croatia
Phone: 385 (0)1-442-409
Fax: 385 (0)1-440-008

Summary: 1. Mechanisms of Reaction in Coorosion and Protection of Metals 1.1. Synergistic action of certain non-toxic compounds has been studied along with some passivating inhibitors commonly used for the protection of steel against corrosion in neutral media. Passivating inhibitors, as nitrite, are not ecologically acceptable and if they could be replaced completely or at least partly by non-toxic substances, the procedure would be of interest in environmental protection. 1.2. The composition and the procedure of treatement of sacrified electrodes for cathodic protection of steel in the seawater has been studied. The alloying elements, Zn, Pb, Sn, and Sb in aluminium anodes have been investigated. The protection effects was estimated by the lowering of electrochemical potential in the region of immunity and by the measurements of protective current. 1.3. Completely clean surfaces of metals are not always available for the protection with inhibitors in the practice, therefore the mechanism of interaction of inhibitors with the corrosion products has been studied. Some natural compounds, ecologically acceptable, were investigated in the presence of the rust on the steel. 2. Synthesis and Surface Properties of Aluminosilicates. 2.1. Factors influencing the synthesis of kaolinite in the system Alumina-Silica-Water under hydrothermal conditions were defined in order to get a well crystallized product. 2.2. Pillar-clays were synthesized and their surface area, the cation exchange capacity and thermal stability detected.

Keywords: 1. corrosion, metals, inhibitors, synergistic action, ecologically acceptable, cathodic protection, sacrified electrodes, rusted steel, oil and gas production corrosion 2. synthesis, surface properties, aluminosilicates, kaoline, "pillar-gline"

Research goals: 1. The use of corrosion inhibitors, successfully applied in the practice has been actually limited or completely restricted due to their toxic properties, as of chromate, or because provoking the eutrophycation, as nitrite or inorganic phosphate, in natural and seawater. To raplace these toxic compounds it is necessary to understand the mechanism of action of newly intruduced low toxic substances, and to define the mixture of compounds with synergistic behaviour. Successful results in the inhibition of steel in the tap water and in the seawater are expected. In the process of inhibition of metals against corrosion very often one is the dealing with partly corroded surface covered with the corrosion products. Certain natural substances are investigated in order to detect their action on rusted steel. Sacrified anodes for the cathodic protection have been studied, mainly aluminium alloys and zincated aluminium to obtained the protection device with optimal life time of the electrode and the minimum of its passivation. 2. The synthesis of aluminosilikates in the solutions of electrolites has been studied under hydrthermal conditions. Synthesis was carried out at temperatures lower than indicated in the equilibrum diagram for the stability phases. "Pillar"-clays were prepared and thier surface properties defined. Obtained products can be applied in industrial catalyisis, as adsorbents, molecular sieves and in drilling muds.


  1. Name of project: Corrosivity of Seawater
    Name of institution: European Federation of Corrosion, The Institute of Materials 1 Carlton House Terrace
    City: SW1Y 5DB - London, UK


  1. Name of institution: Zavod za istraživanje korozije i za desalinaciju HAZU
    Type of institution: State institute
    Type of cooperation: Other
    City: 20000 - Dubrovnik, Croatia

  2. Name of institution: European Federation of Corrosion
    Type of institution: International organization
    Type of cooperation: Other
    City: Frankfurt, Njemačka


  1. Name: Organization of the 7th International Congress of ICSOBA (International Committee for the Study of Bauxite, Alumina and Aluminium).
    Type of achievement: Other
    Authors: Olga Šarc-Lahodny (46003), General Secretary of ICSOBA

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Last update: 10/13/95