Although about 60% of the manufacturers using no clean solder pastes can meet their customers requirements without the additional step of cleaning. The effect of flux composition and ambient climatic conditions on the. A high grade synthetic resin flux and thixotropic agents, the pf608 is ideal for solder reworking with higher temperatures associated with lead free but also suitable for tin lead rework. The second was a other acrylic and we had a lot of adhesion problem. Kester 186 rosin no clean flux 2oz bottle, rma lead free. Being no clean, its not the most aggressive flux out there, but is great for helping solder along. A noclean soldering flux consists essentially of one or more halidefree, water. In most soldering iron tips, the base metal is copper or some copper alloy because of its excellent thermal conductivity. Preheat temperature of between 850 c and 1050 c on the component side of the board is recommended. Ddv2e no clean flux is applicable in any of the existing wave soldering machine used in the industry today. Soldering with noclean flux is a viable alternative for eliminating the laborious post solder cleaning using costly and polluting cfc solvent cleaning. A 62% tin38% lead alloy composition is known as a eutectic composition, and the. Liquid and paste fluxes aims liquid fluxes and paste fluxes are available in a variety of formulations and packaging.
Watersoluble fluxes organic fluxes are commonly called. Proper quality for metal and flux composition checked by highly skilled technician and engineers. Dave, could you bust or confirm another myth about cleaning pcbs from the solder flux. After soldering we using vapor degreaser process with rhotron 225 aesl to clean up the flux. We are a national distributor of soldering stations, consumable and accessories for rework and repair, including noclean, water soluble and rosin flux. The cl flux is kester 979 which is a vocfree, no clean flux formulation for high quality, lowdefect soldering of electronic circuit board assemblies. A variety of no clean solder paste flux residues will be discussed, including a halogencontaining, pbfree solder paste flux.
Could you advice if our process is right, and could you recommend any better solutions andor. For the repair and rework of electronic assemblies the pf608 flux gel can be brushed on, dipped or dispensed by hand or dispensing machine. Kester 959t noclean soldering flux, 5 gal can, light. Given that there are evidently a significant number of different formulations and that one must assume that all or most of these are proprietary, i do not know of any way to obtain them for you. The range is offered from a selection of top trade brands, featuring highly effective products, designed to produce perfect joints, quickly and cleanly. Types of solder flux rosin fluxes water soluble fluxes no clean fluxes. The core provides sufficient activity to solder successfully to bare copper and other hard to solder surfaces. The main function or use of flux in any printed circuit board assembly or rework is to clean and remove any oxide and impurities from the board. Relative wetting performance of multicomp solder wire and halide free competitor products.
Kester soldering flux are available at mouser electronics. Soldering metal requires flux, solder, heat and of course metal. What was discovered was that, coating over no clean is feasible, compatibility is a. After processing the circuit boards we see a white residue. Myth busting solderflux cleaning with isopropanol alcohol. Using wire solder and watersoluble flux for touchup and rework operations will still hasten tip failure.
These are flux that doesnt need any cleaning after soldering process. Flux classification part 1 interpretation of jstd001 and jstd004 regarding fluxes. The effects of partially activated noclean flux residues. Normally noclean flux is not water soluble there is water soluble flux available, but it is not noclean. What was discovered was that, coating over no clean is. The fluxes in most of todays noclean pastes contain 50 percent to 70 percent solids. Leadfree is taking rapid momentum around the world after the eu european union directives to wipe off lead poison from electronic soldering considering its health and environmental effects.
Rosin fluxes are active enough to solder electronic assemblies and the residue has a very good insulation resistance. This very mild cleaning action normally isnt thorough enough to remove oxidization from soldering iron tips. Once the montreal protocol was ratified, industry sought out alternatives to ozone depleting substances. In terms of leaving a clean appearance, noclean solder pastes are as good as any of the watersoluble solder pastes, says dixon. Problem with no clean solder flux residue we have a problem with noclean solder flux residue. No clean flux titration kits m hdt200 titration kit this titration kit is designed for ease in testing the acid number of no clean flux. Does an excellent job of prepping the surface to be soldered. This flux is extremely difficult yo get off of your hands. Metaflux fluxes offer superior wetting and wicking for both spray and foam flux applications.
Three target deposition rates were identified based on the flux. Typically the acidsarcosine weight ratio lies within the range 90. We are using a kester 186 rma flux for our assembly process. The noclean soldering materials used a combination of. At this time in history, many assemblers used rosin based flux compositions as an aid to enable soldering of components onto a circuit assembly. Soldering flux and solder paste compositions which are nonacidic. By preventing the formation of metal oxides, flux enables the solder to adhere to the clean metal surface, rather than forming beads, as it would on an oxidized surface.
Kester flux, no clean solder are available at mouser electronics. Noclean is a process, not a product noclean fluxes can save a lot of processing time, but residues that can be trapped under high density components are. Qualitek no clean flux gel flux gels somerset solders ltd. The flux acts as an agent to clean oxidation from the surface of the metal so that the melted solder can flow.
Noclean flux lead free tin silver copper alloy page 260512 v1. For example, tinlead solder attaches very well to copper, but poorly to the various oxides of copper, which form quickly at soldering temperatures. Soldering flux composition and solder paste composition mec. So why are many electronics assemblers still grappling with. Boards are dry and cosmetically clean as they exit the wave solder machine. We are a national distributor of soldering stations, consumable and accessories for rework and repair, including no clean, water soluble and rosin flux.
Washing is still recommended, however, as residual noclean flux can cause conformal coatings to adhere less effectively. The kester 959t is a noclean, noncorrosive, liquid flux that is designed for the wave soldering of conventional and surface mount circuit board assemblies. However even no clean flux often has enough low resistance that it might influence sensitive circuits, so in case you can live with a few hundreds of megohms resistance between anything, leave. Noclean flux titration kits m hdt200 titration kit this titration kit is designed for ease in testing the acid number of noclean flux. The nature of white residue on global leader in solder and.
Afterward, flux residue can be removed from the solder joint with commercial flux removers. The problem is not limited only to rosin fluxes and solvent cleaning, but also occurs when water soluble fluxes are used and when either flux type is removed with water. Cs soldering processes can be totally manual, totally automatic, or in. The effect of flux composition and ambient climatic conditions on the corrosion reliability was studied using dc leakage current measurements. For situations where theres significant oxidation, a more aggressive flux such as a rosin flux is more appropriate. The no clean, water soluble and rosin based chemistries of aims fluxes offer a broad range of benefits proven to perform well in a variety of applications. How to clean flux residue after soldering our pastimes. I see it often that it is adviced to clean your pcb after soldering with isopropanol alcohol because a. Soldering flux composition and solder paste composition. The main driving force towards leadfree soldering is therefore, through endoflife. The problem most people find with it is that it has a dark residue and when we used to use it on printed circuit boards, the test folks would get upset because it would foul up their test fixtures and test pins. Vikocell no clean solder flux pen for electronics tabbing wire soldering pack of 5 4. A large volume of noclean solder flux residues were also present.
Of course fluxes deliver other processrelated features rheology for printing solder paste, tackiness to hold components etc but these are generally physical rather than chemical. I usually use a dedicated flux cleaner fluxclene is one brand, but many are available. When using solder with a flux core it is important to match the flux type with the pre tinned flux. For the repair and rework of electronic assemblies the pf608 flux gel can be brushed on. Can you tell me if you have to clean an rma flux and what the issues are if we do not. Another type of flux, noclean flux, is only for soldering parts that require little to no cleaning.
So what is then the other kind of flux you may ask. No clean refers to a production process in which cleaning of the final product is deemed unnecessary. As opposed to rosinbased and watersoluble fluxes, they offer a greater application range as well as many advantages with regard to performance. Amtech noclean solder wire is a low residue flux core solder, designed for hand soldering and rework applications. Solder paste flux solder paste, solder flux fct solder. The kester 959t is a no clean, noncorrosive, liquid flux that is designed for the wave soldering of conventional and surface mount circuit board assemblies. Solder needs to melt at a predictable temperature and maintain its mechanical and. A soldering paste flux for use in soldering copper and copper alloy piping and the like is formed of 4070% nonylphenol ethoxylate preferably tergitol no10 made by dow chemical, 1030% glyceryl monostearate, 310% acid activator, 310% water, and 415% mineral salt. Aug 02, 1994 the solder paste composition of the present invention can be prepared by blending the soldering flux composition prepared according to the abovedescribed manner and a solder powder. Soldering flux composition and solder paste composition mec co. Plumbing solder and fluxes are used to join two pieces of metal together, generally copper, safely and effectively, to form a water tight barrier to prevent possible water leaks. Kester 951 no clean soldering solder liquid flux reflow 4.
Noclean solder flux chemistry and temperature effects on. Liquid flux no clean clflux kester 979 2 oz ounces. Heavy noclean flux residue with visible copper corrosion. The solder paste composition of the present invention can be prepared by blending the soldering flux composition prepared according to the abovedescribed manner and a solder powder. Flux exists to clean metal surfaces of their natural surface oxide layer so that molten solder alloy can wet the underlying metal and form a permanent strong bond. Flux or solder paste soldering process combinations previously tested or qualified in accordance with other specifications do not. Soldering with no clean flux is a viable alternative for eliminating the laborious post solder cleaning using costly and polluting cfc solvent cleaning. A solder flux composition comprises a mixture of sarcosine and tartronic or tartaric acid dissolved in water and an aliphatic alcohol.
No clean flux core solder wire no clean flux core solder. Why clean a noclean flux global leader in solder and. The soldering iron tip the soldering iron tip transfers thermal energy from the heater to the solder connection. Solder flux composition international standard electric. The sir boards prepared with pbfree noclean solder paste flux vehicles were reflowed with the following profiles figures 3 and 4. To eliminate cleaning, the flux and soldering process must. Choosing the correct flux types and their advantages. In terms of leaving a clean appearance, no clean solder pastes are as good as any of the watersoluble solder pastes, says dixon. Even with soap and water and a stiff bristle brush it wont easily come off. The soldering and cleaning processes involve so many chemicals in the flux, circuit board.
Many of the solvents used to clean printed circuit boards were classified as ozone depleting substances. The first was a acrylique and we didnt see any probleme. The problem most people find with it is that it has a dark residue and when we. Cleaning of organic flux is important which is why we use a no clean flux where the residue is non conductive and non corrosive. Application of the flux can be any of the three methods. Us5297721a noclean soldering flux and method using the same. In most industrial and consumer electronics applications cleaning will not be required and the product may therefore be used to complement a no clean wave soldering or reflow process or to allow repairs to cleaned boards without the. Safety data sheet sds according to 19072006ec, article 31.
Us20010025673a1 composition for increasing activity of a no. One of those alternative was noclean soldering materials. Rosin flux more often has been used for electronic assemblies when the white residue. Water soluble and no clean fluxes for lead free solder alloys in both alcohol and water based carriers. Noclean solder paste was supposed to obviate the need to clean circuit boards. A preferable ratio by weight of the soldering flux and a solder powder is 12. Kester 959t noclean soldering flux, 5 gal can, light yellow. Kester 951 is a zerohalogen, nonrosin flux designed for wave soldering, conventional and surface mount circuit board assemblies. There are allpurpose, heavy duty, noclean, rosin and watersoluble flux. We apply conformal coating on no clean residu since some years and with several conformal coating and we have as many result that conformal coating. There are allpurpose, heavy duty, no clean, rosin and watersoluble flux.
Fct assembly manufactures and sells a wide variety of soldering products. C3 localized extraction confirmed that high levels of conductive and corrosive residues were only present in. These include solder pastes, wire solder, bar solder, liquid flux, and gel flux. Common specifications used to test soldering pastes and fluxes include ipc, bellcore telcordia, and japanese industrial standards jis. No clean flux core solder wire products kester global leader in solder and solder. Nov 01, 2003 the fluxes in most of todays no clean pastes contain 50 percent to 70 percent solids. In many cases, paste components will have more than one function. Pdf noclean solder flux chemistry and temperature effects on. No clean flux lead free tin silver copper alloy page 260512 v1. We set out to establish what methods would be the best to characterize compatibility and what materials would be best suited to perform the task.
An activated noclean flux composition for soldering includes a dicarboxylic acid, an organic solvent, and acetic acid in. Soldering flux, professional use of solder application of the substance the preparation. It is much more aggressive, and may damage the material it is left on or the solder or components. There are several reasons to remove noclean flux residues from pcbs.
Lowsolidsnoclean fluxes in general, have less active chemistry and are more challenging to solder with than rosin or water soluble. Please use with adequate ventilation as it smokes a lot as it heats up. Although about 60% of the manufacturers using noclean solder pastes can meet their customers requirements without the additional step of cleaning. Kester 830186 mildly activated rosin liquid flux pen for leadbearing and lead free alloy, 0. There is no such thing as a noclean solder paste, only a low residue solder paste, whose flux residue after reflow, may not have to be cleaned from the board, to ensure board functional reliability. Ra, rma, water soluble and no clean fluxes for tinlead solder alloys in both alcohol and water based carriers. Solder flux is an important part of soldering as it cleans the oxide before soldering, to have a good solder bond oxide must be removed. The hand held titrator reads in digital units simplifying process control.
Another type of flux, no clean flux, is only for soldering parts that require little to no cleaning. If all of the noclean flux is not heat activated could it have a negative effect on the circuit board assembly. Noclean is a process, not a product noclean fluxes can save a lot of processing time, but residues that can be trapped under high density components are raising reliability concerns. Fluxes are used in the first place to clean the metal surface to be soldered, and. A solder flux composition, including an amount of tartronic acid or tartaric acid and an amount of sarcosine dissolved in a solvent comprising water or a miscible mixture of water and one or more aliphatic alcohols, wherein the weight ratio of said amount of acid to said amount of sarcosine is from 90.
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