Page 87: of Maritime Reporter Magazine (April 1984)

New Anti-Corrosion Paint

Pigments Unveiled By BP

Scientists at BP's Research

Centre at Sunbury-on-Thames,

England, have succeeded in devel- oping a family of new anti-corro- sion pigments. These pigments, which have been widely patented, are based on the ion-exchange principle—a radical departure from existing technology.

Almost all metal fabrications such as offshore installations and bridges need to be protected from atmospheric corrosion by over- coating with anti-corrosion paints.

Existing anti-corrosion paints gen- erally contain corrosion inhibitors such as highly toxic lead or chro- mate compounds.

In contrast, the BP pigments have low or nil toxicity, and when formulated into paint primers out- perform currently available prod- ucts containing zinc phosphate, zinc chromate, red lead, etc., for similar costs. The BP pigments function by the principle of ion ex- change. Aggressive ions, such as chloride, permeating the paint film are preferentially ion-exchanged with the solid pigment particles, releasing the active anti-corrosion agents that then protect the metal surface. As the anti-corrosive agents are released only when re- quired, the BP system is said to last longer than traditional paints.

The low toxicity and improved performance of the BP pigments has already aroused considerable interest among paint manufactur- ers. BP will be launching these new materials through BP Ven- tures in the first half of 1984.

For further information on BP's new pigments,

Circle 19 on Reader Service Card

Westinghouse Secures U.S.

Patent On Self-Protecting

Sensing Cell Electrodes — Literature Available

The Combustion Control Divi- sion of Westinghouse Electric Cor- poration recently received a U.S. patent for its self-protecting elec- trodes in its Hagan, in situ flue gas sensing cell, and has incorpo- rated this feature into the Hagen

Model 240 excess oxygen/excess combustibles flue gas analyzer.

Previously, patents on the self- protecting electrodes had been is- sued in Belgium, Canada, and the

U.K.

This self-protecting feature es- tablishes the Hagan analyzer as a highly reliable flue gas sensor. It is said to be particularly effective in combustion processes that ex- perience reducing stack gas at- mospheres containing sulfur.

Low excess air firing or fuel-rich conditions cause sulfur in the fuel to combine with platinum elec- trodes within the in situ sensor to form platinum sulfide, resulting in serious electrode deterioration. This condition presented problems to the traditional in situ excess oxy- gen analyzer in the past, particu- larly in those applications with re- ducing or high sulfur flue gas atmospheres. This patented self-

Load-deflection curve of closed cell flexible foam. protection feature of the Hagan excess oxygen/excess combustibles analyzer is an outgrowth of the successful model 218 and model 225 probe type analyzers. West- inghouse established the model 218 analyzer as the first in situ zirconium oxide excess oxygen sensor in 1971.

Just as in the traditional zircon- ium oxide excess oxygen analyzer, the new excess oxygen/excess com- bustibles analyzer requires no sample system, no sample probes, no scrubbers or pumps, and is suit- able in flue gas temperatures ranging as high as 1,400 F (760

C). The sensor has a field-replace- able cell, with low installation and maintenance costs.

For further data and free litera- ture on the new electrodes,

Circle 89 on Reader Service Card

NO CHAINS, NO TIRES

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Send for the Samson Fender Manual; and the next time you need tendering, make sure you get the Samson quote. From 2 x 3 to 12 x 28 (or larger), FlexTen will give you the best performance for the best price.

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March 15, 1984 Circle 132 on Reader Service Card 89