New maintenance products from International

Citation

(2002), "New maintenance products from International", Anti-Corrosion Methods and Materials, Vol. 49 No. 5. https://doi.org/10.1108/acmm.2002.12849ead.008

New maintenance products from International

New maintenance products from InternationalKeywords: Coatings, Anti-corrosion

International Coatings Ltd, part of the Akzo Nobel group of companies, has introduced two new Marine maintenance products: Intershield 803, an abrasion-resistant, anticorrosive coating and Interbond 808 aluminium, a surface-tolerant, sea water ballast tank coating.

In recent years there has been an increased awareness of the need for effective corrosion control, particularly in cargo holds and in sea-water ballast tanks. One of the main reasons for this increased awareness is the number of ship losses which have occurred, where corrosion of the vessel structure may have been a contributory cause.

Intershield 803

While cargo holds are the revenue-earning spaces of a bulk carrier, it is the structural integrity of these vessel areas which is vital to the continuing profitability and safe operation of the ship. Abrasion-resistant cargo hold coatings defend against, and facilitate the management of, corrosion. This defence may employ a number of mechanisms, singly or in combination, the most common of which is barrier protection, which involves the placement of an effective barrier between the abrasive or corrosive environment and the substrate. When subjected to abrasion, an essential requirement of a high performance barrier coating is that it must be tough enough to resist mechanical damage, thus minimising exposure of the underlying substrate to the cargo hold environment. In designing abrasion-resistant coatings, physical and mechanical properties are therefore very important. Intershield 803 has reportedly been specifically designed to provide excellent abrasion and corrosion resistance, good cohesive and adhesive strength and good resistance to under-film corrosion creep. Intershield 803 is stated to be compatible with surface preparation standard Sa2 (ISO 8501-1:1998, SSPC-SP6), which is practically achievable in cargo holds. This is a particularly important feature for operators of older vessels. Typically applied as a two-coat system in cargo holds, Intershield 803 claims the following key features:

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  excellent abrasion resistance;

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  rapid attainment of mechanical properties, even at low temperatures (< 10°C);

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  can be applied to surfaces prepared to Sa2 (vessel area-dependent);

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  FDA-compliant;

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  certified for the carriage of grain;

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  smooth surface;

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  222g/lt VOC-compliant (EPA method no. 24);

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  tar-free;

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  aromatic amine-free.

Intershield 803 may also be applied to protect critical outer hull vessel areas including the underwater hull, boottop and topsides. It is unlikely that polymer-based coating systems will ever be developed to totally resist all forms of cargo hold abrasion.

Interbond 808 aluminium

In sea-water ballast tanks, where physical factors combine to make on-board refurbishment or repair difficult (e.g. corrosion, pitting, existing coatings, restricted access and damp, humid conditions), surface preparation, coatings application and subsequent in-service performance can, almost inevitably, be compromised. For these on-board projects the use of specifically designed surface and damp-tolerant anticorrosive coatings is especially recommended.

Interbond 808 aluminium is described as a practical refurbishment and repair coating suitable for use in sea-water ballast tanks, coffer-dams, void spaces, wet spaces, bilges and crude oil tanks.

Interbond 808 aluminium provides high levels of corrosion protection and, in addition, the unique combination of adhesion promoters and special surfactants maintains performance on compromised substrates. Applied as a single coat (or as a two-coat system in combination with Interbond 808 Buff), Interbond 808 aluminium claims the following key features:

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  high levels of corrosion protection;

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  surface tolerance;

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  damp tolerance;

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  light colour;

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  tar-free;

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  high build;

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  one-coat application capable (Interbond 808 aluminium);

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  179g/lt VOC-compliant (EPA method no. 24);

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  rapid sea-water ballast loading;

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  DNV B1 classification;

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  epoxy technology;

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  plus stripe coats in line with good painting practice.

Further details are available from: International Coatings Ltd. Tel : +44 191 401 2417; Fax: +44 191 401 2561; E-mail: jim.brown@uk.akzonobel.com; Web site: www.international-marine.com