Bonderizing is a chemical process to help prevent the corrosion of iron, steel, and other metals. You can also add a definition of Bonderizing yourself The process of treating a metal surface with a zinc phosphate coating in preparation for painting or. Bonderizing Process. Lubricating film for cold forging of aluminum-based metal. Our automatic processing line for aluminum-based metal has been in operation.
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Search the history of over billion web pages on the Internet. Full text of ” Bonderizing a rust resisting base for paint finishes that can be quickly and easily produced. Bonderizing is a modern development, designed to keep step with fast moving industries. Its purpose is to provide a rust inhibiting paint base that can be produced quickly and bonderizng, and at the same time assure more positive adhesion and durability of applied finishes on iron, steel or zinc surfaces.
Since its introduction inBonderizing has found its way into the finishing systems of hundreds of the largest manufac- turing plants in the world, where the products require the greatest measure of protection and finish beauty. It is a tried and proven process that has attained world-wide acceptance.
In other words, the process entails actual chemi- cal reaction between the metal and the Bonderizing chemicals, whereby the surface is changed into a composition that is insoluble in water and hence highly resistant to the effects of moisture. The crystalline coating produced provides the best type of base for paint finishes and being integral with the metal itself, it assures pdocess adhesion than any other available known type of finish.
The Bonderizing Process is not only used more extensively on sheet metal units requiring a type of finish that will provide a high lrocess of rust resistance and maintain fine appearance over a period of years, but is now so improved as to widen its scope of effectiveness to include hot rolled honderizing, zinc coated surfaces, and zinc base die castings. Important Bon- derizing applications include automobile bodies, wheels, fenders and hoods, as well as refrigerators, sterilizing and medicine cabinets and numberless other products of similar bbonderizing as well as window sash and galvanized sheet steel.
The difficulty of maintaining paint finishes is due to three main causes: Corrosion of the underlying metal, lack of adhesion of the paint film procfss the metal, and the durability of the organic paint film itself. It was to overcome the first two of these difficulties of finish maintenance that Bonderizing was de- veloped. The result obtained by Bonderizing is a chemical conversion of the metallic surface to a non-metallic Photomicrograph of a piece prrocess plain, polished sheet steel.
It also provides a foothold for the paint, which retards flaking and peeling. The finishing material flows into the interstices between the fine crystals and, when dry, is securely anchored to the metal. There is no distortion nor dimensional change result- ing from the Bonderite Process. Bonderizing eliminates, so far as possible, the human element in obtaining a satisfactory surface for painting.
It not only provides for better ad- hesion and durability of finishes applied over it, but provides a check on cleaning operations as well.
It removes the last traces of grease or drawing com- pounds, neutralizes any residual alkali or surface rust remaining on the work, and eliminates hand bonedrizing that may have accumulated prior to pro- cessing. More than that, should the paint film be scratched or dented so that bare metal is exposed, the Bon- derite coating retards the spread of rust and the development of alkali through electro-chemical ac- tivity around the injury.
It is a non-conductor of electrical currents, affording protection from electro- chemical corrosion of the metal. Should the paint film become scratched or damaged in any way, rust will be confined to the damaged area.
Rust will not creep back under the paint film, damaging a wider area. Any piece of steel will develop electro-positive and electro- One cm never all before testing just where these O-negative bbonderizing electro-positive areas will occur, but we have never tailed to get a strong test for us iron at one area and a strong test for hydroxy] ion.
It usually takes longer for the pink to show up because the hydroxyl ion must first neutralize the hydrogen ion from the acid present on the panel, but prlcess this neutralization once has taken place, the phenolphthalein indicator turns decidedly red very quickly. The fact that enough hydroxyl ion will concentrate at an electro-positive area to neutralize so much free acid gives some idea of how important the formation of alkali is from a paint standpoint.
With this knowledge of what actually takes place under the paint film when applied to steel, obviously something besides boneerizing cleaning and high-quality paint is necessary to fix the coating and prevent premature failure. Bonderizing before finishing will stop the spread of rust and alkali underneath the paint film, even w hen the paint film is scratched sufficiently to allow corrosion to take place. And, in proof of this, if a Bonderized panel is placed in the same agar medium referred to above, we get practically no test for ferrous iron and none for alkali.
The Bonderite coating is an insulator and conse- quently stops the flow of small electrical currem that the alkali does not migrate to the electro positive areas, and does not become sufficient! Light areas show where alkali has de- stroyed the paint film surrounding rusted abrasion.
Figure 2 is a Bonderized steel panel with two coats of baked enamel, pricked and subjected to hours in the salt spray. Slight rust ap- pears where metal was exposed, but no spread- ing of corrosion or alkali to surrounding area has taken place. Figure 3 is a reproduction of four-color photo- graph of plain, untreated steel sample tested in agar agar medium. Blue areas indicate dissolv- ferrous iron. The pink area shows the development of alkali. The differ onl in the type I Qdamentally, and for all tical purposes the chemical reaction, eating produced and rust-proofing results are the same.
The Parker technical stall not onlj recommends the type of installation best Mined to the manufacturer’s requirements, mil designs and suppl. Like all metal finishing methods, Bonderizing requires a clean surface and in both types of Bonder izing installations, the proper cleaning and rinsing equipment is usually included in the installation plans. There are, of course, many detailed variations to fit them to the physical and production require- ments, but such variations are worked out in advanOl b the Parker technical staff.
The processing bath is prepared by mixing the necessar Bonderite Chemicals with water and either immersing or mechanical Spraying the prodlM for a sufficient time to transform the metal sir to a phosphate coating. It is especially adapted to the needs of the manufacturer whose production requirements are limited. While the complete process is standardized so far bonderziing procedure is concerned, there is no “standard” style, size or shape of tank equipment. Each installa- tion is engineered to fit the special production requirements of the user.
The set-up for immersion Bonderizing will ordi- narily include a heated tank for alkali cleaning, a heated tank for clear water rinse, the Bonderizing tank, followed by another hot water rinse and a final hot chromic acid rinse. All units of the installation, including cleaning, processing and rinsing are usually placed in line so that one overhead track and hoist will serve for all the tanks.
The Bonderizing tank should be insulated to con- serve heat and fitted with heating units of sufficient size to maintain the solution at degrees F. The processing bath is prepared by mixing the concentrated Bonderite chemicals with water, in which the cleaned production is immersed bonderizong a suf- ficient length of time to produce the characteristic phosphate coating.
Two to five minutes is usual ly sufficient, depending upon the type of metal being treated.
As the chemical strength of the bath is depleted, it is restored by the addition of Bonderite replenish- ing chemical. The amount of Bonderite required to bring the bath back to normal chemical concentration is de- termined by a simple titration test that is easily accomplished by the operator. Spra-Bonderizing supersedes and replaces the older conveyor system, whereby the production was passed through a huge tank of processing solution.
Now processing is accomplished by spraying the Bonderite solution onto the bondeeizing as it passes through different chambers on a completely mechan- ized conveyor line, including cleaning, Bonderizing, rinsing and drying. Due to the short processing time, equipment re- quirements are minimized, less floor space proceds needed, and, by recirculating the solution, it is possible to process a given amount of work with a smaller volume of working solution.
As the work progresses bonderizjng the conveyor line through the various steps of cleaning, Spra-Bonder- izing and rinsing, it passes a series of standpipes equipped with spray nozzles through which the solution is forced against the material from every conceivable angle, flooding all areas to be treated. The equipment is assembled in a steel housing with reservoirs below, where solutions are accumulated, ready for circulation. Control prcoess the processing bath is the same as that followed in the immersion method.
While cleaning is not a part of the Spra-Bonderiz- ing Process, yet, like all other metal-finishing pro- cesses, a clean surface is necessary for satisfactory results and cleaning is included in the set-up as one of the normal operations in a procesx mechanized line. Rinsing is included, after cleaning; also after the processing operation — after cleaning to make sure that no foreign matter is carried into the Bon- derizing section, and, after processing, to remove any traces of processing solution prior to the chromic acid rinse and drying.
Immediately following cleaning the bonderizung is sprayed with Bonderizing solution. Reaction on the metal is immediate. The size of the processing sec- tion and speed of the conveyor are adjusted to allow usually sixty seconds in the Bonderizing spray.
Normally, production passes immediately from the Spra-Bonderizing section to dual rinsing, and then to final finishing. To make sure that all moisture is eliminated from seams, cracks and crevices, a bonverizing oven is included at the end of the line. Automobile bodies on their to Spra-Bonderizing. In fact, each year sees further extensive use- of bohderizing protective process on a greater number of parts as it is applied to bodies, hoods, mouldings and wheels. With the rapid increase in the use of Bonderizing by the automobile companies, it is not surprising that there should be a still greater increase in its prlcess on all types of automobile accessories.
Bonderizing Process | Sinwa Mekki | Joetsu,Niigata,plating,decoration
Once an auto- mobile builder recognizes the value of Bonderizing, he insists on similar protection by suppliers of acces- sories such as wheels, lamps, horns, heaters, bumper brackets and scores of smaller parts. In addition, there are many accessory manufac- turers who adopt Bonderizing, not to meet manu- facturer’s specifications, but as a sound quality fea- ture of a well-manufactured product.
Of all the products to which Bonderizing is ap- plied, none of them demonstrate its rugged char- acter quite so forcefully as its use on the automobile. Being in many cases continually exposed to the weather and under the necessity of presenting a fine finish appearance for a number of years, Bonderizing provides better finish protection than can be secured ptocess any other way. After nearly ten years’ experience with the effects of Bonderizing, the dealer sells the Bonderized car with the assurance that, barring acci- dent, the owner will not be subjected to untimely finish reconditioning expense.
The conditions surrounding refrigerators are espe- cially conducive to rust. Bonderizimg inside and warm out- side induce condensation, unless perfect insulation can be provided, which is not always the case. The steaming, humid atmosphere of the kitchen or res- taurant is especially corrosive.
It seeks out and creeps through microscopic openings in the finish and sets up corrosion until the whole panel is affected. Bon- derizing under the finish overcomes this difficulty. The gasoline pump cabinet bonserizing benefitted by Bonderizing for two reasons: To offset the effects of constant weather exposure and to resist the action of the various fumes to which the finish bonderizimg subjected.
Bonderizing helps to reduce the cost of station main- tenance and keeps pump equipment looking better without frequent refinishing. The considerable list of Bonder ite users is being extended rapidly. It is finding its way into the finish- ing lines of many varied industries, helping to main- tain finish appearance and cut down complaints be- cause of rusty products.
It is ever opening market possibilities for some- products, such as in the case of zinc die castings — by permitting highly durable paint-type finish — so that they can now be assembled into a complete product, where such finish of the die cast parts is necessary from an appearance standpoint.
Additional products on which Bonderizing is pro- viding protection from rust are: It is now used in the mass production finishing systems of most of the Leaders in the manufacture of steel windows, also by makers of air conditioning equipment, medicine cabinets, switch and meter boxes, window screens, elevator cabs, steel partitions, as well as galvanized sheets, from which eare troughs, doors and display racks are made.
The desirabilit of Bonderizing on metal that is BO be exposed to weather or inside moisture and humidiq is a well known fact In actual salt spraj tests on thousands of test pieces, it is found that Bonderizing increases the effectiveness of paint coat- ings anywhere from three to five times, bonderuzing upon the type Of paint and method bonderizin applica- tion.
M an ufact urers of architectural products will find this a strong selling point. A few outstanding manufacturers o products using Bonderizing: Detroit Steel Products Co.
Fentron Steel Works, Inc. Seattle, Wash Soule Steel Co. Ohio I tetroic, Mich. Al- most always the need for a solution of his problem is such that he is unable to await the result of tests of prospective finishes or processes under atmos- pheric conditions.
To meet this condition, various accelerated labora- tory tests have been devised to create in a matter of days the effects that might require years of weather- procesw to produce. While there are many different tests for checking the comparative resistance of various coatings, the salt spray and humidity tests have been widely adopted by industry in checking enamels and lacquers.
The breakdown of the test piece is usually characterized by the flaking of the finish from in- creasingly large areas as the test progresses. The breakdown of the test pieces is indicated by the blistering of the paint film.
The Soak test consists of immersing the samples in water, maintained at F.