1、SSPC-Paint 29April 1, 2002Editorial Revisions November 1, 20041. Scope1.1 This specifi cation covers highly pigmented primers that contain zinc dust as the major pigment component (minimum 65% by weight in the dry fi lm) and are defi ned by their ability to protect ferrous substrates.1.2 The vehicle
2、 type may be inorganic (Type I) or organic (Type II).1.3 Each primer type (I and II) is classifi ed according to the level of exterior performance at a severe marine site. Laboratory performance criteria are also included.1.4 This specifi cation does not cover weldable precon-struction primers such
3、as SSPC-Paint 30.1.5 Zinc-rich coatings, both topcoated and untopcoated, have been used successfully in a wide variety of environmental zones. For a detailed breakdown of applicability of various types of zinc-rich coatings in different environmental zones, refer to SSPC-PS Guide 12.00. Consult the
4、coating manufacturer for specifi c exposure recommendations (see Note 13.1).1.6 This coating is intended for application by spray for use by itself or as a primer in a multi-coat system.2. Description2.1 USE OF SPECIFICATION2.1.1 Primers meeting this specifi cation are categorized according to vehic
5、le type and performance level. 2.1.2 If no vehicle type is specifi ed, either Type I, inorganic, or Type II, organic, is acceptable (see Section 2.3).2.1.3 If no performance level is specifi ed, Level 1 is assumed (see Section 2.5).2.2 COMPOSITION: The coating described in this specifi cation consis
6、ts of zinc dust, functional additives, and an organic or inorganic binder with appropriate solvents (see Note 13.2).2.3 VEHICLE TYPES2.3.1 Type I-A, inorganic post-curing vehicleswater soluble, include materials such as alkali metal silicates, phosphates, and modifi cations thereof which must be sub
7、sequently cured by application of heat or a solution of a curing compound (or curing solution).2.3.2 Type I-B, inorganic self-curing vehicleswater-reducible, include water soluble alkali metal silicates, quaternary ammonium silicates, phosphates, and modifi cations thereof. These coatings cure by a
8、reaction among the zinc, silicate, steel substrate, and naturally occurring carbon dioxide during and after evaporation of water from the coating.2.3.3 Type I-C, inorganic self-curing vehiclessolvent reducible, include titanates, organic silicates, and polymeric modifi cations of these silicates. Th
9、ese systems are dependent upon moisture from the atmosphere to complete hydrolysis, forming the titanate- or polysilicate-zinc reaction product.2.3.4 Type II, organic vehicles covered by this specifi cation, may be chemically cured or may dry by solvent evaporation (see Note 13.3). Under certain con
10、ditions, heat may be used to facilitate or accelerate drying and curing. 2.4 COMPONENTS: These zinc dust primers may consist of one, two, or three components.2.5 EXTERIOR PERFORMANCE: The primer shall be classifi ed as follows according to the minimum number of months of successful performance at a
11、severe marine site (see Section 9.3): Level 1: 12 months Level 2: 30 monthsThe performance requirements of the coated test panels are summarized in Table 1.3. Referenced Standards3.1 The latest issue, revision, or amendment of the refer-enced documents in effect on the date of invitation to bid shal
12、l govern unless otherwise specifi ed. Those documents marked SSPC: The Society for Protective CoatingsPAINT SPECIFICATION NO. 29Zinc Dust Sacrifi cial Primer, Performance-BasedSSPC-Paint 29April 1, 2002Editorial Revisions November 1, 20046-108with an asterisk (*) are referenced only in the Notes or
13、the Appendix, which are not requirements of this specifi cation.3.2 If there is a confl ict between the requirements of any of the cited referenced documents and this specifi cation, the requirements of this specifi cation shall prevail.3.3 SSPC STANDARDS AND JOINT STANDARDS:Guide 13 Guide for the I
14、dentifi cation and Use of Industrial Coating Material in Computerized Product Databases PA 2 Measurement of Dry Coating Thick-ness with Magnetic GagesPaint 9 White (or Colored) Vinyl Paint * Paint 20 Zinc-Rich CoatingType I (In-organic) and Type II(Organic)Paint 30 Weld-Through Inorganic Zinc Primer
15、PS Guide 12.00 Guide to Zinc-Rich Coating Systems* PS 12.01 One-Coat Zinc-Rich Painting SystemSP 1 Solvent Cleaning SP 5/NACE No. 1 White Metal Blast CleaningVIS 2 Guide and Visual Reference Pho-tographs for Evaluating Degree of Rusting on Painted Steel Surfaces3.4 ASTM INTERNATIONAL STANDARDS:1A 57
16、2 Standard Specifi cation for High-Strength Low-Alloy Columbium-Vanadium Structural SteelBlister Rating,ASTM D 714All 10All 10All 10All 10All 10All 10-1 Two of three panels must have 10 ratings, third panel can be a 9.TABLE 1PERFORMANCE REQUIREMENTSTestSalt Fog ResistanceType I (IOZ) primer Type II
17、(OZ) primerExterior ExposureType I (IOZ)Level 1Level 2 Type II (OZ)Level 1Level 2Adhesion (ASTM D3359)Types I and 2Unaged PrimerSalt Fog AgedPrimerNo. of Specimens33333333Exposure Time3000 hours1000 hours12 months30 months12 months30 months-Rust Rating, SSPC-VIS 2/ASTM D610All 10All 1010, 10, 9*9 mi
18、n.10, 10, 919 min.Minimum rating of 4BMinimum rating of 3BScribe Undercutting, ASTM 1654Slight rust in scribe,no undercuttingSlight rust in scribe, no undercutting0.8 mm (1/32 inch) max.1.6 mm (1/16 inch) max.0.8 mm (1/32 inch) max.3.2 mm(1/8 inch max.)-SSPC-Paint 29April 1, 2002Editorial Revisions
19、November 1, 2004B 117 Practice for Operating Salt Spray (Fog) ApparatusD 185 Test Methods for Coarse Particles in Pigments, Pastes, and PaintsD 520 Specifi cation for Zinc Dust Pigment* D 562 Test Method for Consistency Measuring Krebs Unit (KU) Viscosity of Paints Using a Stormer-type ViscometerD 7
20、14 Test Method for Evaluating Degree of Blistering of Paints* D 1141 Standard Practices for Substitute Ocean Water* D 1296 Test Method for Odor of Volatile Solvents and Diluents* D 1475 Test Method for Density of Liquid Coatings, Inks, and Related Products* D 1535 Practice for Specifying Color by th
21、e Munsell System * D 1640 Test Methods for Drying, Curing, or Film Formation of Organic Coatings at Room TemperatureD 1654 Test Method for Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments* D 2369 Test Method for Volatile Content of Coatings* D 2371 Test Method for Pigmen
22、t Content of Solvent-Reducible Paints* D 2621 Test Method for Infrared Identifi cation of Vehicle Solids from Solvent-Reducible Paints D 3278 Test Methods for Flash Point of Liquids by Small-Scale Closed-Cup ApparatusD 3359 Test Methods for Measuring Adhesion by Tape TestD 3925 Practice for Sampling
23、 Liquid Paints and Related Pigmented CoatingsD 4417 Test Methods for Field Measurement of Surface Profi le of Blast Cleaned Steel* D 5894 Practice for Cyclic Salt Fog/UV Exposure of Painted Metal, (Alternating Exposures in a Fog/Dry Cabinet and a UV/Condensation Cabinet)G 92 Practice for Characteriz
24、ation of Atmospheric Test Site* G 154 Practice for Operating Fluorescent Light Apparatus for UV Exposure of Nonmetallic Materials* G 155 Practice for Operating Xenon Arc Light Apparatus for Exposure of Nonmetallic Materials3.5 FEDERAL SPECIFICATIONS AND STANDARDS:2FED-STD-141 Paint, Varnish, Lacquer
25、 and Related Materials: Methods of Inspection, Sampling and Testing* Method 3011 Condition in Container Method 4331 Spraying PropertiesMethod 4541 (Canceled) Working Properties and Appearance of Dried Film 3.6 AMERICAN ASSOCIATION OF STATE HIGHWAY AND TRANSPORTATION OFFICIALS (AASHTO) STANDARD:3* M3
26、00 Inorganic Zinc Rich Primer3.7 AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) STANDARD:4Z129.1 Hazardous Industrial ChemicalsPrecautionary Labeling4. Composition Requirements4.1 The manufacturer is given wide latitude in the selection of materials and manufacturing processes.4.2 PIGMENTATION4.2.1 Th
27、e major pigment component in these coatings is zinc dust of the type described in ASTM D 520 (see Note 13.4). The paint shall contain a minimum of 65% zinc dust pigment by weight in the dry fi lm.4.2.2 Other pigment components may include extenders, curing aids, tinting colors, and suspension and po
28、t-life control agents.5. Standard Testing Conditions5.1 TEST PANELS: The hot rolled steel test panels shall conform to ASTM A 572. Panel size shall be 100 mm x 150 x 3.2 mm (4 x 6 x 1/8 inches) or greater. Test panels shall be solvent cleaned in accordance with SSPC-SP 1 prior to blast cleaning. The
29、 test panels shall be blast cleaned in accordance with SSPC-SP 5 and have a blast profi le of 44 to 57 micrometers (1.75 to 2.25 mils). Measure the blast profi le in accordance with ASTM D 4417, Method C.5.2 APPLICATION: The coating shall be spray-applied as a single coat in accordance with the manu
30、facturers written recommendations.1 ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.2 FED STD 141 Available from USA Information Systems, Inc. 1092 Laskin Road, Suite 208, Virginia Beach, Va. 23451. This standard is available on-line from .3American Association of State H
31、ighway MIL-P, etc.), Federal Test Method Standards (141), and the Canadian Government Specifi cations Board. However, it should be emphasized that a well designed non-standard test may often provide more meaningful information for a given service condition than one or more standard tests. Some suppl
32、ementary performance tests are described in the Appendix.13.7 QUALIFIED MARINE EXPOSURE SITES: A marine site is always in close proximity to the ocean. Other criteria for classifying the environment, such as corrosion rate of bare steel or bare zinc (in accordance with ASTM G 92) or mean annual prec
33、ipitation and temperature, may also be required when agreed to among contracting partiesThe 25-meter (80-foot) lot at LaQue Corrosion Services, Wrightsville Beach (Kure Beach), NC, has been shown suitable for this specifi cations exterior marine exposure. The above test site has an average bare stee
34、l corrosion rate of about 100 to 125 micrometers (4 to 5 mils) per year, based on panels exposed for 12 months. Short term corrosion rates derived from panels exposed for one to three months can be as high as 500 to 750 micrometers (20 to 30 mils) per year.Another suitable location is Ocean Citys Ma
35、rine Atmospheric Exposure Site. This is located near the town of Sea Isle City, New Jersey. The test site is approximately 30 m (100 feet) from the ocean and is bordered on the west by a saltwater bay and marsh land. Mild steel corrodes at 43 micrometers/yr (1.7 mils/year) under natural conditions a
36、nd 460 micrometers/yr (18.1 mils/year) with sea spray. Zinc corrodes at 2.3 micrometers/yr (0.09 mil/year) under natural conditions.13.8 INTERIM QUALIFICATION: Level 1 qualifi cation may be used as an interim qualifi cation for a candidate zinc primer. Under this scheme, a procuring agency could acc
37、ept the primer for use on small structures, partial structure painting, or other limited applications. The interim qualifi cation would be valid for a period of 18 months, at which time the longer test fence exposures (Level 2) would be completed.13.9 The procurement documents should establish the r
38、esponsibility for samples, testing, and any required affi davit certifying full compliance with the specifi cation.13.10 QUALITY ASSURANCE TESTS: If the user chooses, tests may be used to determine the acceptability of a lot or batch of a qualifi ed coating. The quality assurance tests are used to d
39、etermine whether the supplied products are of the same type and quality as those originally tested and certi-fi ed for acceptance. The selected tests should accurately and rapidly measure the physical and chemical characteristics of the coating necessary to verify that the supplied material is subst
40、antially the same as the previously accepted material. SSPC-Paint 29April 1, 2002Editorial Revisions November 1, 2004All of the quality assurance tests must be performed on the originally submitted qualifi cation sample. The results of these tests are used to establish pass/fail criteria for quality
41、 assur-ance testing of supplied products.13.10.1 Establishing Quality Assurance Acceptance Criteria: Many ASTM test methods contain precision and bias statements. Specifi cation developers should be cognizant of the fact that these statements exist. Quality assurance test criteria should not be more
42、 stringent than the interlaboratory precision of the test methods used. Example: A common quality assurance test is density (weight per gallon) as measured by ASTM D 1475. The interlaboratory reproducibility at the 95% confi dence level tells us that because of errors associated with the method, any
43、 two measurements of the same material can differ by as much as 1.8%, without the measurements being considered suspect. This only represents the precision of the measure-ment technique and does not account for normal variances in the manufactured product.The acceptable range for paint density must
44、be stated. For example, a composition specifi cation may state this requirement as 10.0 0.2 lb/gal, 10.0 lb/gal 2%, or as a range from 9.8 to 10.2 lb/gal. The manufacturer of proprietary products should provide this information. Using these values, if the manufacturers lab measures the density to be
45、 9.8 lb/gal, the product meets the specifi cation and the paint is shipped to the job. Because of the lab-to-lab variation of 1.8%, the users lab may measure the density of this sample to be as low as 9.8 less 1.8% of 9.8 (equals 9.6) lb/gal. Similarly for the high end, the manufacturer may measure
46、density of 10.2 lb/gal, while the user measures 10.2 plus 1.8% of 10.2 (equals 10.4) lb/gal. The pass/fail criteria for the user to accept a batch of paint should therefore be 9.6 to 10.4 lb/gal.Where precision and bias data are not available for a given test method, determine the standard deviation
47、 of a minimum of fi ve measurements taken on the originally tested and certifi ed material. The pass/fail criterion is that the measurement of the test sample shall fall within two standard deviations of the target value. The contracting parties must agree on a target value.13.10.2 Recommended Quali
48、ty Assurance Tests: Recommended quality assurance tests include but are not limited to, infrared analysis (ASTM D 2621), viscosity (ASTM D 562), weight per gallon (ASTM D 1475), total solids (ASTM D 2369), dry time (ASTM D 1640), percent pigment (ASTM D 2371), color (ASTM D 1535), condition in conta
49、iner (FED-STD-141, Method 3011), and odor (ASTM D 1296).13.11 Another SSPC specifi cation for zinc-rich coatings is SSPC-Paint 20.APPENDIXSupplementary Performance TestsWhile not required to meet the requirements of this specifi -cation, the following or other performance tests may be valuable to the purchaser because of the diversity of possible service environments in which these primers may be used. Agreement between contracting parties as to these tests and results must be established before issuing procurement documents.A.1 BULLET HOLE TESTA
