Degreasing agents with passivation effects

Pragolod 13 is a liquid, highly efficient both alkaline as well as surfactant degreasers of a high passivating capability suitable for cleaning of steel, cast iron, glass and ceramic ware. The agent contains adsorption corrosion inhibitors which may impart both inter-machinery operations as well as temporary corrosion protection to the steel parts to be degreased.

The agent is appropriate for the inter-machinery degreasing operations and for machine cleaning, e.g. in the WAP devices or in cleaning desks in the machine repair shops. It may be even used at lower application temperatures and, therefore, as an alternative to solvent degreasers including chlorinated ones at hand-assisted or machine cleaning.

Pragolod 14 is particularly suitable for the degreasing and cleaning of the steel and cast iron substrates between two subsequent technological operations and should be applied by spraying. It contains low-foaming surfactants and, hence, is convenient to be especially used for machinery cleaning, e.g. in the WAP spraying machines or in cleaning desks in the shops. Furthermore, it may be alternatively applied for cleaning at lower temperatures and, therefore, for both machinery as well as hand-assisted cleaning operations as a replacement for solvent-based degreasers including chlorine hydrocarbons. To boost the anticorrosion protection affect of the agent, its elevated concentration within 3 – 5% and drying without a preliminary rinse should be employed. Pragolod 14 is a liquid alkaline agent for combined technological operations degreasing together with surface passivation and is formulated on the basis of both low-foaming surfactants of high biodegradability and corrosion inhibitors. It should be particularly used for both spraying and immersion degreasing of steel and cast iron substrates and tumbling of ferrous metals. Besides, it may be used for passivation of ferrous metals after pickling or other technological operations in water – based agents if an active steel surface is needed to be pasivated. Pragolod 14 is completely free of any inorganic components which otherwise might cause salt deposits on the cleaned but still unrinsed surface. It is also applicable for the passivation of the ferrous surfaces after other degreasing operations, pickling in acids or tumbling operations of steel parts together with the passivation. At the agent formulation, both low foaming and passivating efficiency were emphasized and, therefore, compared with the similar agents of, however, enhanced foamability such as Pragolod Grato 12, Pragolod 13 or Pragolod 44, displays a slightly inferior degreasing performance. Pragolod 14 is a clear colourless or yellowish alkaline liquid (pH value within 10 – 11) completely miscible with water, the clouding point of the 5% bath being about 33 – 38°C and the pH value about 10.

Strongly alkaline, low-emulsifying degreaser of medium foamability, suitable for the bath regeneration by an oil separator and microfiltration. It does not contain any complex-forming substances and the surfactants employed are easily biodegradable. It should be especially used for removal of thick deposits of oil-based coatings applied before for the temporary protection, or of other strongly bonded impurities. The dispergator contained is highly efficient for cleaning from graphitic particles and filing dust which otherwise are very difficult to be released off the metallic surface. Due to the specific anticorrosion inhibitors, the bath of the agent even enables to degrease non-ferrous metals, such as copper, aluminium and its alloys and zinc, without their etching, despite the fact the bath is alkaline. Besides, the inhibitors will ensure inter-machinery operations protection of both steel and copper alloys parts after degreasing. Before the painting, it is necessary for a possible residual surface alkalis from the agent bath to be rinsed with water thoroughly.

Strongly alkaline and medium foaming degreaser together with the passivation effect in one bath, suitable for cleaning of steel. The agent is nitrites-free and its bath will create on steel substrate a very thin invisible passivation layer made of iron oxides and capable to protect it against corrosion. It should be applied by immersion in containers or by spraying in cleaning machines and used in such cases the excellent temporary anticorrosion protection is required. The possible residual alkalis from the bath must be rinsed thoroughly from the surface before painting.

A liquid, surfactant-based and alkaline degreaser of high performance and medium foamability, with passivating effect, suitable predominantly for cleaning of ferrous metals, glassware and ceramics. The agent contains the additives capable to impart a temporary corrosion protection to the metallic surface treated. It may be applied by wiping, immersion in containers, chamber spraying or in travelling-through spraying chambers, with the assistance of high pressure vapour or ultrasonic at the temperatures above 20 °C, with the respect to the character of the grease and the way of application. If a temporary anticorrosion protection and passivating effect of the parts after degreasing are required, it is recommended to add Pragokor Grato 12 in the concentration 0,2 – 1,0 % into the last rinse step, just before drying.