Bases cleaners

Cleaning, the removal of unwanted matter, is the beginning of the treatment cycle for metal. The unwanted matter may be carbon smut, welding flux, ink, oxidation products, oil, fingerprints, or other material. Cleaners may be classified as solvent-based or aqueous. Within the aqueous class there are many subclasses, the most important of which are the alkaline cleaners. There are also a variety of ways to apply cleaners. As of the mid-1990s, solvent-based cleaner usage is declining. 

Checking the bath concentration The concentration of bath solution in caustic-based cleaners can be checked by a simple titration method as noted below, while for the remaining types of cleaners, a visual check of the degreased surfaces will be sufficient. The titration method is as follows ... 

When using alkali base cleaners, protect the eyes and skin from direct contact with the chemical. 

Both anodic and general inhibitors are nonpassivating and are suitable for use with hydrochloric acid-based cleaners. Other inhibitor groups include filming amines such as polymethylimine and diamines, the rosin-amine ketones, and also some of the imidazoline surfactants. The imidazolines provide increased protection at levels up to their critical miscelle concentration (CMC), above which there is a leveling off as a thick, adherent diffusion barrier is formed. 

Chelant-based cleaners are also used, however, for many situations, and it is now becoming more common to use a slow and steady on-line cleaning protocol by the use of polymer/phosphonate-based, multiblend formulations. These programs employ relatively high doses of active product and can be expensive to use in large volume systems, but are unlikely to cause blockages, corrosion, or other damage to the system itself or any sensitive components. 

There are alternatives to sodium hydroxide and other strong base cleaners. One alternative involves using ammonia, NH3, which is a weak base. If a bowl of dilute ammonia solution is placed in an oven and left for several hours, most of the grease and grime can be wiped off. 

Cleaning and passivating Caustic base cleaner and HNO3 passivating... 

Sometimes the abrasive is given as an optional ingredient in an otherwise completely liquid cleaning formula. In one example of this type, the abrasive is combined into a terpene/limonene solvent-based cleaner while remaining stable [45], In another example, the surfactant instead of the abrasive is largely eliminated [46],... 

Wood floor cleaning also seems to be a special case for some consumers with cleaners formulated for this particular use [193], Certainly, wood floors have a higher sensitivity to water-based cleaners than almost any other type of flooring. This is one of the few types of dilutable cleaner in which soap is seen as the main surfactant [194],... 

Acid Thickener. [Exxon/Totnah] Sur-factiuit vise, builder, corrosion inhibits for acid-based cleaners. 

Carlb-Tank and Machine Washes. [Carib Int l.] Biod radable water-based cleaners for printing and pad dyeing operations. 

SOURCE Exxon Chemical Co. D-Limonene Based Cleaner Formulations... 

An important consideration in selecting solvents or solvent-based cleaners is their solvent-cleaning abilities, which may be predicted or experimentally measured by... 

Fast drying and surfactant-free water-based cleaner using microphase cleaner technology pH neutral aqueous cleaner, with long bath life... 

Uses Surfactant, o/w emulsifier for detergent and l l applies., water-resist. (surfactant-free) coatings, solv.-based cleaners, coatings, airfresh-eners, agric. sprays, adhesives, etc. 

Uses Emulsifier for oil-based cleaners, oil-spill dispersants, emulsiion polymerization of vinyl resins, cosmetics emulsifier, lubricant in metalworking fluids, textile auxs. antifoam antistat... 

Besides the already mentioned solvent based cleaners, there are some special solvents on the market. However, due to their physical and toxicological character, most of them are used for special applications. The advantages and disadvantages of the different products are summarized below. 

Water-based cleaners based on MPC technology Satisfactory results in stencil cleaning with aqueous systems can only be achieved for the removal of solder paste. Most aqueous systems used to remove adhesives failed in the past because the water caused the adhesives to set. 

The phase transition produces a cleaning mixture that exhibits die properties of bodi solvent-based and water-based cleaners. Water-like properties allow die cleaning agent to effectively dissolve ionic contaminants and remove them from the substrate s surface. 

Aqueous based cleaners of MFC Technology Removal of adhesives and solder paste Wide process window Non-flammable Rapid drying Residue-free drying Long bath life Agitation of the cleaner (spray, ultrasonic, spray under immersion, overflow) necessary... 

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