59 research outputs found
Corrosion of brass in a natural and artificial seawater under anaerobic conditions
The corrosion of brass in deoxygenated nonbuffered
and buffered artificial and natural seawater was
studied. The weight gains and the average corrosion rates
of brass samples, immersed in both media during periods of
1 week, 1 and 3 months, were determined.
The morphology of the corroded surfaces, with and
without the corrosion products, was analyzed by visual
observation and scanning electron microscopy (SEM).
Energy dispersive spectroscopy (EDS) was used for the
identification of the corrosion products and X-ray diffraction
(XRD) for the identification of the crystalline
corrosion products.
In general it was concluded that deoxygenating and
buffering, at pH 9, both contribute to enhance the corrosion
of brass in seawate
Crescimento De Cana-de-açúcar Sob Aplicação De Biofertilizante Da Bovinocultura E Ureia
Effluents from intensive cattle breeding and treated with anaerobic reactors are highly relevant for agricultural reuse. Current paper assesses the growth of sugarcane cultivars SP 803280 and RB 867515 for 220 days. Doses 0, 16, 48, 64, 80 and 96 kg ha-1 N were applied derived from biofertilizing sources produced by cattle-breeding waste water and urea. Experimental design comprised randomized blocks with 96 splits and four replications. The cultivars fertilized with biofertilizers caused growth similar to those fertilized with urea. Doses 64, 80 and 96 kg ha-1 had the best efficiency in growth. Since average height of 3 m was obtained for cultures at the end of the experiment, urea may be replaced by biofertilizers.9497398
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