Abstract:
Disclosed is a continuous method for treating the surface of metal strips. In said method, a surface property-modifying layer having a maximum thickness of 3 µm is applied by means of a device comprising at least one Fourier transform IR spectrometer which faces a coated side of the strip, operates using reflection geometry, and records IR spectroscopic measurement data of the applied surface property-modifying layer while the metal strip advances in order to characterize the surface.
Abstract:
The present invention relates to a method for passivating metallic surfaces, wherein the metallic surface is brought into contact with an aqueous composition containing at least one water-soluble polymer (X) that comprises acid groups, and at least one polyamine (P), wherein the pH of the composition is in the range from 0.5 to 2.
Abstract:
Method of increasing the permeability in subterranean formations comprising rock that is soluble by acid, in particular carbonatic formations, using a formulation comprising at least an acid and a retarding surfactant which is an amphoteric surfactant. Preferably, the acid comprises methanesulfonic acid.
Abstract:
Alkanesulphonic acid microcapsules and the use thereof as an additive for acidizing applications in carbonatic rock formations, especially for increasing the permeability of underground carbonatic petroleum-bearing and/or natural-gas-bearing and/or hot-water-bearing rock formations, and for dissolving carbonatic and/or carbonate-containing impurities in the production of petroleum and/or natural gas or in hot-water geothermal power generation. Additionally described is an acidic formulation comprising the microcapsules of the invention, and the use thereof for the aforementioned purpose, and also a corresponding process.