Since most of these process environments contain only very low oxygen partial pressures or exhibit high concentrations of extremely aggressive compounds, the conventional, uncoated materials come to their limits.
Metallic artifacts of archaeological and historical interest, exposed to outdoor environmental conditions, can be affected to a great extent by degradation, due to the presence of aggressive compounds in the surrounding environment.
Fuel used in diesel engines for naval propulsion contains high levels of impurities, principally vanadium and sulfates, that can react to form aggressive compounds, responsible for hot corrosion phenomena, leading to severe degradation of the engines' components, especially exhaust valves.
29, 30 FR scavengers slow down the reactions of oxidation or "catch" FRs, transforming them into less aggressive compounds.
The repair may be as simple as using a more aggressive pad compound in the front or less aggressive pad compound in the rear.
One of the most common causes of the decay of concrete structures is contact with aggressive chemical compounds.
Excessive noise, water percolation, production of dust as a result of the deposit removal, or use of aggressive chemical compounds had to be absolutely avoided.
For example, there is a large amount of potential enzymes in genome of P. putida KT2440, which evolutionarily endow this strain with capacities to host a variety of biodegradation pathways and enable it to withstand exposure to diverse types of aggressive aromatic compounds, such as naphthalene, 4-chloronitrobenzene, 2,4-xylenol and phenol [ 18].
In contrast, acetic acid seems to be a more aggressive indoor organic compound for a larger range of objects.
We have achieved outstanding results through an aggressive growth strategy13% compounded annual sales in [the four years through June].
