Agents with passivating and inhibition performance

Low-foaming, both chromates and nitrites-free, neutralizing and passivating agent suitable for both temporary as well as inter-machinery operations protection of the parts made of steel, cast iron and other ferrous metals. It may be applied by immersion or spraying as the last operation just before the drying, after the last rinsing step. The surface passivated is compatible with all types of paints, including water-based and powder coatings.

Low-foaming, both chromates and nitrites-free, neutralizing and passivating agent suitable for both temporary as well as inter-machinery operations-protection of the parts made of steel, cast iron, aluminium and other non-ferrous metals. It may be applied by immersion or spraying as the last operation just before the drying, after the last rinsing step. The surface passivated is compatible with all types of paints, including water-based and powder coatings. The feature of the bath is a big start-up neutralizing power at a low bath concentration.

Non-foaming neutralizing and inhibiting agent suitable for the leakage tests of steel pressure tanks and cylinders provided with brass or aluminium valves and, besides, for temporary and inter-machinery operations anticorrosion protection of the parts made of steel, aluminium and copper alloys. It may be applied by immersion or spraying as the last operation just before the drying, after the last rinsing step. The surface passivated is of alkaline reaction and its compatibility with paints, if required, should be checked at first. The passivation process does not impede a subsequent phosphating.

Pragokor O 160 is suitable for the corrosion protection of steel and cast iron between following machinery operations by the surface adsorption of corrosion inhibitors contained and should be applied after both degreasing as well as pickling processes in machinery, automotive and steel or cast iron processing industries as the last rinse-free technological operation just before drying, after the preceding rinse. With regard to its low alkalinity and absence of any inorganic substances, it may be further used for the corrosion inhibition of the parts before painting.

Pragokor O 170 is suitable for the passivation rinses of the surfaces of both steel and cast iron parts and, furthermore, copper and aluminium alloys just after the degreasing, pickling, plating and other water-based surface treatment operations in which the active surface results. Moreover, the surfaces treated are temporarily protected against corrosion at their further assembly and storage. It proved the excellent protection capability against flash corrosion at the pressure tightness tests of metallic containers.

Pragokor BP is a liquid concentrate for the passivation of phosphated steel, without chromates or other ecologically troublesome chemicals. The salt content in the Pragokor BP bath is very low which accounts for a low loading of waste water with salinity. Due to the bath Pragokor BP, the microscopic pores through the phosphate coatings or other imperfections are passivated, the passivating effect being even superior to that of many other chromate-based passivating agents.

Pragokor BP will even passivate the active surfaces no-phosphated steel and aluminium and magnesium alloys, further zinc coatings and zinc castings after their degreasing or activation in other wet surface treatment processes. Moreover, the agent is of superior performance for the passivation of compounded materials, such as aluminium castings with embedded steel parts etc. and as a conversion adhesion layer under paints.

Low-foaming, both nitrites and chromates-free, emulsion-based agent with inhibition and neutralization affects, suitable for both temporary as well as inter-machinery operations-protection of steel, cast-iron and copper alloys against corrosion. It proves very well for the sealing and preservation of phosphate and alkaline blackening coatings and, unlike other preservation agents for metallic substrates, will not impede a possible subsequent painting. It should be applied by immersion or spraying techniques as the last operation just before drying, after the last rinse step. Once passivated, the passivation affect remains and the surface treated may be again rinsed in demineralised water because the corrosion inhibitors contained are strongly bonded to the surface by chemisorption. The surface passivated is compatible with all types of paints and powder coatings, only in the case of water-based paints the compatibility should be checked at first as the surface becomes a bit hydrophobic after the passivation. The feature of the agent is the high anticorrosion performance functioning even at a very low start-up concentration of the bath. To boost the inhibition affect, it is convenient to add the agent into the both degreasing as well as tumbling baths of the pH value ranging from weak acid to strong alkaline which results in passivation of the surface and anticorrosion protection in one combined surface treatment operation. In such a case, the compatibility with subsequent painting, if required, should be checked thoroughly at first. The addition of Pragokor Inhibitor 51 into the baths of the cationic-based agents must be avoided.

Non-foaming and corrosion inhibiting agent, making the surface treated hydrophobic, without both toxic chromates and nitrates content, convenient for the passivation of the active surface of copper, brass, bronze, silver and its alloys and, partially, zinc as well. As for copper and its alloys, the agent should be used either as an anticorrosion protection for the period between two consecutive machinery operations or as a finish treatment after degreasing, tumbling, pickling, surface burning, patina coating, plating or other water-borne operations. The agent forms a very thin transparent layer of adsorption corrosion inhibitors of the capability to passivate and make hydrophobic the metallic surface and, therefore, to boost its corrosion durability. It proves, besides, as an inter-machinery operations protection against the corrosion aggressiveness of the human sweat which may occur if the parts treated are touched with bare hands. The agent is fully compatible with the following solvent-based paints and powder coatings, increases their adhesion to the substrate and prevents formation of visual defects under the transparent varnishes.