- Standard Guide for Preparation of Metal Surfaces for Adhesive Bonding_百度文库
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- US5114495A - Use of azeotropic compositions in vapor degreasing - Google Patents
The particle size can be verified by sieve test in accordance with 5. The compressed of the specification.moiconspalmo.cf
Standard Guide for Preparation of Metal Surfaces for Adhesive Bonding_百度文库
All dust, dirt, oil, grease, moisture, soot, air used for blast cleaning should be free of condensed water or tar, or other contaminants should be removed from unpainted oil by making certain that separators and traps are in working surfaces. Previously painted surfaces should be similarly order. Test the compressed air supply in accordance with Test cleaned of all foreign matter; all deteriorated coating should be Method D The abrasive material should be free of soluble removed as well. Mortar or cement drippings from earlier contaminants when tested in accordance with Test Methods repairs should be removed by mechanical or chemical means.
High-pressure water blasting is often done in the manner and to the degree specified, that is, hand, used to remove these contaminants. When the removed from pockets, crevices, obstructed areas such as existing coating contains regulated heavy metals such as lead gusset plates and connections, and tops of horizontal surfaces. SSPC Guides 6 and 7 present information undersides of members. On lead removal projects, cleaned and then treated in accordance with the specified inspectors should be familiar with OSHA requirements for method in Practice D Alternatively, the surface may be their own health and safety.
The method and inspection of brush-off blast 5. If painting is done outside, 5. Vapor degreasing or before nightfall brings lower temperatures and possible mois- immersion in an alkaline or acid cleaning solution are com- ture condensation on the surfaces. When surface preparation monly used in shop work. In the field, water wash followed by and painting are carried on indoors, overnight delays between solvent, steam or detergent cleaning is a good starting point. The material is erection site should be stored on blocks to prevent contact with described in Practices D, Type B, Method 8 and is covered the ground, and where it is least likely to be marred, scratched, by SSPC in Paint Lead pigmented primers should never be or subjected to harmful contamination by grease, oil, salt, etc.
The minimum treatment for Insofar as practicable, the steel should be stored to avoid the aluminum is Type B, Method 3 of Practices D, which formation of waterholding pockets. If outdoor storage lasts for describes the use of an alcoholic phosphoric acid cleaner. The or other readily identifiable parts of the work.
The cleaning of length of time between shop priming and erection and subse- each section, bay, or part of the work should be entirely quent topcoating should be kept to a minimum to avoid the completed, inspected, and accepted before any coating is problem of intercoat adhesion. The specification should contain limits on the amount 5. The system shop-coated surfaces should be cleaned of dust. If necessary to of alternately cleaning and painting short sections by one remove grime and oil substances, they can be wiped, steam workman is not good practice since this can lead to surface or cleaned, power washed with detergents or cleaned with sol- intercoat contamination.
It may sometimes be necessary to clean newly coated been cleaned of slag and weld spatter. It is important that every surfaces using some of the specified methods between the coat of the system be applied over dry, soil-free surfaces, and various coats. Great 5. Washing may also be necessary between 5. Be aware that standing water on uncured paint fications are being followed with reference to the painting or can result in early failure.
He should ensure that surfaces not in a problem. If a particular overall new finish coat to all surfaces of the structure. The material is in question, do not use it until it has been tested by inspector of maintenance repainting should be alert for several the manufacturer or independent laboratory and found to be conditions not encountered in the painting of new work.
This should be cut loose from the sides of the container, removed, is particularly important with spot-blast cleaning. If it is felt that the skins are thick enough to 5. Before the overall finish coat is 6. When it is not possible to use the supplied containers 5. Where there is coating removal and overcoating can be an issue.
Some noticeable settling, and mixing is done either by power specifications put limits on the allowable amount of surface agitators or by hand, most of the vehicle should be poured off soluble salts. Inspectors may be called upon to measure soluble into a clean container.
The pigment is then lifted from the salt concentrations on the substrate surface. SSPC Guide 15 bottom of the container with a clean, broad, flat paddle, lumps presents several methods for extracting salts from the surface broken up and the pigment thoroughly mixed with the vehicle and several methods for measuring the salt concentration in the present. The poured-off vehicle should be returned slowly to extract. Surface soluble salt concentrations should be measured the original container with simultaneous agitation. It is also in areas where salt would most likely be present such as pitted useful at this point to mix or pour repeatedly from one areas.
Practice D presents the unmixed pigment. Two component paints should be mixed the procedure for evaluating adhesion of maintenance coatings. After the individual 5. The coating should not be mixed or where he discovers such conditions, require that the surface be kept in suspension by means of an air stream bubbling under cleaned and repainted.
Any coating that shows ensure homogeneity and to remove skins and foreign matter. If the defects are general, rather than existing in a strainer is normally satisfactory for most coatings, unless some few isolated areas, use of a different type of coating may be specific size is required in the specification. Containers should necessary.
Coating Storage and Handling 6. Some materials may even require thinners should be stored in areas or structures that are constant agitation during use. Storage should be 6. Materials susceptible to damage at partially react prior to thinning or application. Too high a storage temperature reduces the be thoroughly mixed as described in 6. If a coating is stocked for a to the temperature recommended by the coating manufacturer.
This will prevent volume ratio by plural component equipment through heated or hard settling and thus make mixing quicker and easier when the insulated lines coating lines to specialized mixing equipment coating is to be used. Should the coatings while others do not. This section describes some contractor wish to reduce the viscosity by heating, to make commonly accepted procedures when thinning is permitted.
In-line heaters are also example using manufacturer-supplied thinner from unopened available for application equipment. It thinning instructions , the painting inspector may need to should be noted, however, that heating of the coating alone will submit to an agreed-upon testing laboratory a sample from not compensate for ambient or surface temperatures, or both, if each batch to be thinned, together with a sample of the thinner they are below the minimum specified for that material. For to be used, using clean sample containers in both cases.
A products to be applied by plural component spray this section request is submitted with these samples for advice on the does not apply, see 6. Weather Considerations 6. Environmental conditions such as tem- or both, should be added. Thinning is carried out by pouring perature and relative humidity can affect the cure of most about half of the thoroughly mixed coating into an empty, clean coatings. The required thinner is then added and the two portions are remixed to obtain a homogenous mixture.
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The requirements the thinner. This speeds acceptance of a coating. The inspector effects. Within the limitations of the composition of the should keep a record of all paint modifications, amount of coating, this may be satisfactory, depending upon the type of thinning, weight per gallon, and viscosity.
Where dry-film coating and providing the surface is dry. Painting over ice or thickness is specified, the inspector should verify the new wet frost will result in early adhesion failure of the coating. Compliance with the specification 7. A surface that is too hot may cause the coating required to obtain the specified dried-film thickness, coating solvents to evaporate so fast that application is difficult, the percent volume of the nonvolatile solids in the original blistering takes place, or a porous film results.
To keep the coating must be known. This figure is readily obtained from the temperature down it may be desirable, where practical, to paint manufacturer.
US5114495A - Use of azeotropic compositions in vapor degreasing - Google Patents
With this information the calculation may be under cover at a shop or to protect the surface from the sun made as follows: with tarpaulins. This is especially true where: in spring and fall when days are warm and nights are cool. High humidity can also solids, and affect the cure of some coatings.
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If it is suspected that the temperature and added. When thinning satisfactory temperature. The technique is from dry to sidered when applying coatings in areas where airborne over- wet, with the coating applied to the surface and spread back to spray could damage automobiles, boats, and structures nearby. Coating should be worked Heavy winds result in considerable loss of coating and exces- into all irregularities in the surface, crevices, and corners.
This results in Runs, sags, or curtains should be brushed out. Surfaces that are an inability of the film to flow together dry spray. If inaccessible for painting with brushes and on which spraying is uncorrected, dry spray may create holidays, leading to poor not permitted should have coating applied by means of performance, and it can interfere with adhesion of the applied sheepskin daubers. Edges and corners of all metal work, nut surface. These problems can be avoided by utilizing brush or heads, bolts and nuts, and all individual members, bars, shapes, roller application methods instead of spray, scheduling the and plates should be striped by brush painting in advance of the work at the less windy times of day, changing materials to the application of coating to other parts.
They should not exceed 8. Coating Application mm 4 in. The brushes should be kept in a clean, immediately prior to painting to ensure that spent abrasive, acceptable condition when not in use. The inspector should dust, and debris have been completely removed. ISO prohibit the use of any brush not in an acceptable condition.