1、 Standard Practice Definition of Set Soluble Salt Levels by Conductivity Measurements This NACE International standard represents a consensus of those individual members who have reviewed this document, its scope, and provisions. Its acceptance does not in any respect preclude anyone, whether he or
2、she has adopted the standard or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not in conformance with this standard. Nothing contained in this NACE International standard is to be construed as granting any right, by implication or otherwise, to manufactu
3、re, sell, or use in connection with any method, apparatus, or product covered by Letters patent, or as indemnifying or protecting anyone against liability for infringement of Letters Patent. This standard represents minimum requirements and should in no way be interpreted as a restriction on the use
4、 of better procedures or materials. Neither is this standard intended to apply in all cases relating to the subject. Unpredictable circumstances may negate the usefulness of this standard in specific instances. NACE International assumes no responsibility for the interpretation or use of this standa
5、rd by other parties and accepts responsibility for only those official NACE International interpretations issued by NACE International in accordance with its governing procedures and policies which preclude the issuance of interpretations by individual volunteers. Users of this NACE international st
6、andard are responsible for reviewing appropriate health, safety, environmental, and regulatory documents and for determining their applicability in relation to this standard prior to its use. This NACE International standard may not necessarily address all potential health and safety problems or env
7、ironmental hazards associated with the use of materials, equipment, and/or operations detailed or referred to within this standard. Users of this NACE International standard are also responsible for establishing appropriate health, safety, and environmental protection practices, in consultation with
8、 appropriate regulatory authorities if necessary, to achieve compliance with any existing applicable regulatory requirements prior to the use of this standard. CAUTIONARY NOTICE: NACE international standards are subject to periodic review, and may be revised or withdrawn at any time in accordance wi
9、th NACE technical committee procedures. NACE International requires that action be taken to reaffirm, revise, or withdraw this standard no later than five years from the date of initial publication. The user is cautioned to obtain the latest edition. Purchasers of NACE International standards may re
10、ceive current information on all standards and other NACE International publications by contacting the NACE International FirstService Department, 1440 South Creek Dr., Houston, Texas 77084-4907 (telephone +1 281-228-6200). Approved 2013-03-16 NACE International 1440 South Creek Dr. Houston, Texas 7
11、7084-4906 +1 281-228-6200 ISBN 1-57590-260-5 2013, NACE International NACE SP0213-2013 Item No. 21172 SP0213-2013 NACE International i _ Foreword The purpose of this standard is to present a relevant and reasonably achievable set of soluble salt contamination values obtained from surface conductivit
12、y measurements and based on known common industry-specified values. This standard provides a method to clearly describe specific levels of soluble salt contamination from testing for the purpose of specifying surface cleanliness prior to coating. It is not the intent of this standard to preclude mea
13、surements of soluble salt contamination by other methods. This standards intent is to define and clarify the selected salt level values, and describe how those values are to be obtained. The salt contamination values in Table 1 are derived from empirically measured values collected worldwide from se
14、veral sources. They are given in mg/m2 as equivalent sodium chloride (NaCl) as if the conductivity measured were all from NaCl. This provides a consistent weight value per unit area. Increased soluble salt values may increase the potential for coating system failure when compared in identical enviro
15、nmental exposures. This standard is intended for use by engineers, specification writers, test equipment suppliers, contractors, and anyone who wishes to specify maximum acceptable amounts of soluble salts on surfaces to be coated. It further refers the user to a separate standard for determining th
16、e equivalence of other measurement procedures that can be used under this standard. The user may consider using one of the soluble salt levels in Table 1 in a specification. The specifier should determine the most suitable level from the set of soluble salt contamination values found in Table 1. Thi
17、s standard was developed by NACE International Task Group 418, “Risk Assessment for Salt Contamination,” which is administered by Specific Technology Group (STG) STG 04, “Coatings and Linings, Protective: Surface Preparation.” It is sponsored by STG 02, “Coatings and Linings, ProtectiveAtmospheric,”
18、 STG 03, “Coatings and Linings, ProtectiveImmersion and Buried Service,” and STG 44, “Marine Corrosion: Ships and Structures.” This standard is issued by NACE under the auspices of STG 04. In NACE standards, the terms shall, must, should, and may are used in accordance with the definitions of these
19、terms in the NACE Publications Style Manual. The terms shall and must are used to state a requirement, and are considered mandatory. The term should is used to state something good and is recommended, but is not considered mandatory. The term may is used to state something considered optional. _ SP0
20、213-2013 ii NACE International _ NACE International Standard Practice Definition of Set Soluble Salt Levels by Conductivity Measurements Contents 1. General 1 2. Soluble Salt Levels 2 3. Salt Levels . 2 References 3 Bibliography 3 Appendix A: Standard Method for Performance of Soluble Salts Testing
21、in Accordance with ISO 8502-9 . 4 Appendix B: Commentary 7 _ SP0213-2013 NACE International 1 _ Section 1: General 1.1 Numerical Salt Level Values 1.1.1 The assessment and determination of surface contamination (by salts) prior to application of protective coatings can be critical to estimating and
22、attaining the desired service life of the coating system in a given environment. 1.1.2 Application of protective coatings over salt contamination may cause degradation of the coating system and substrate. This may lead to breakdown of the corrosion protection provided by the coating system. These ef
23、fects can reduce the expected service life of the coating. 1.1.3 It is the intent of this standard to provide a set of defined salt levels that can be used by the industry. In any given environment, salts are usually present on surfaces to some degree. It is not the intent of this standard to provid
24、e guidance to the industry on how to mitigate soluble salt contamination. 1.1.4 This standard does not suggest what level of salt is acceptable in any given application. It provides a set of defined soluble salt values currently utilized in the marketplace. The user may use these to specify surface
25、cleanliness requirements before coating. 1.2 Determining Numerical Surface Salt Values 1.2.1 Numerical determination of the quantity (level, in accordance with Table 1) of surface nonvisible soluble salt shall be performed using a field method for the conductometric determination of water-soluble sa
26、lts in accordance with ISO(1) 8502-91 or an equivalent method as determined by NACE SP0508.3 The “Bresle method” for extraction of soluble salt contaminants is performed in accordance with ISO 8502-6.2 The field execution of ISO 8502-6 involves using a syringe to inject deionized water into the Bres
27、le patch, washing the substrate surface inside the patch, then extracting the test water for direct measurement of conductivity. Details of this procedure are provided in Appendix A (mandatory). Once a conductivity value is determined by the conductivity meter, expressed as microsiemens per centimet
28、er (S/cm), ISO 8502-9 provides a procedure to calculate the NaCl equivalent weight of the surface concentration as total surface density of the salts (in mg/m2). 1.2.2 It is not the intent of this standard to preclude measurement of soluble salt contamination by other methods as long as the values g
29、enerated are equivalent to those generated by ISO 8502-9. Any equivalent tools, methods, or procedures must demonstrate they meet the criteria defined in NACE SP0508. (1) International Organization for Standardization (ISO), 1 ch. de la Voie-Creuse, Case postale 56, CH-1211 Geneva 20, Switzerland. S
30、P0213-2013 2 NACE International _ Section 2: Soluble Salt Levels 2.1 This standard considers only the total amount of salts as measured by the ISO 8502-9 method and defined herein, or by an equivalent method qualified under NACE SP0508. For the purposes of this standard, all references to performing
31、 a test by ISO 8502-9 shall mean performing a test by following the test process parameters detailed in Appendix A or using an equivalent method in accordance with NACE SP0508. 2.2 Salt Level Definition: The levels, in mg/m2, of sodium chloride (NaCl) in Table 1 are based on conductivity measurement
32、s of samples calculated as if all salts present were present as NaCl. This provides a defined and consistent numerical value. The salt levels in Table 1 represent different levels of maximum allowable salt. An increasing value represents an increasing potential for coating system failure when compar
33、ed in identical environmental exposures. These values are not directly related to an end result failure mode in any given application. They represent a relative quantity of NaCl equivalent weight on the surface. It is implied that the rate of coating failure may increase with increased salt levels.
34、2.3 The user should choose a level or value appropriate to yield the expected performance considering the coating system utilized, the environment, and the exposure the coating system will be expected to face. While measured salt levels of zero may be preferred, it is understood that the cost to ach
35、ieve very low levels may be prohibitive; therefore, the specifier should evaluate the cost to achieve a level of cleanliness versus the desired end result, which is usually the desired service life of the coating system. _ Section 3: Salt Levels Table 1 lists total equivalent weights of sodium chlor
36、ide (NaCl) and assigns them to various categories. Table 1: Category of Total Equivalent Weight of NaCl NACE Salt Level Total NaCl Equivalent Salt Weight Salt Contamination Category Name mg/m as NaCl mcg/cm (g/cm) Equal to or Less than Equal to or Less than NACE Salt Level A SL-A 10 1 NACE Salt Leve
37、l B SL-B 20 2 NACE Salt Level C SL-C 30 3 NACE Salt Level D SL-D 50 5 NACE Salt Level E SL-E 70 7 NACE Salt Level F SL-F 100 10 NACE Salt Level G SL-G 200 20 NACE Salt Level H SL-H 300 30 NACE Salt Level J SL-J 400 40 3.1 The numerical weight equivalent values listed in Table 1 are based on empirica
38、l data collected from the International Maritime Organization (IMO) Resolutions,4 U.S. Military Sealift Command (MSC), International Standardization Organization (ISO), NORSOK(2)-M501,5 and other documents in the public domain. The task group settled on these numerical values after study of the abov
39、e references. (2) Standards Norway, Srandvein 18, P.O. Box 242, N-1326, Lysaker, Norway. SP0213-2013 NACE International 3 3 _ References 1. ISO 8502-9 (latest revision), “Preparation of steel substrates before application of paints and related products Tests for the assessment of surface cleanliness
40、 Part 9: Field method for the conductometric determination of water-soluble salts” (Geneva, Switzerland: ISO). 2. ISO 8502-6 (latest revision), “Preparation of steel substrates before application of paints and related products Tests for the assessment of surface cleanliness Part 6: Extraction of sol
41、uble contaminants for analysis The Bresle method” (Geneva, Switzerland: ISO). 3. NACE SP0508 (latest revision), “Methods of Validating Equivalence to ISO 8502-9 on Measurement of the Levels of Soluble Salts” (Houston, TX: NACE). 4. Resolution MSC.215(82) to IMO Maritime Safety Committee (MSC) Subcom
42、mittee on Ship Design and Equipment (DE) (London, UK: IMO, December 8, 2006). 5. NORSOK M-501 (latest revision), “Surface preparation and protective coating” (Lysaker, Norway: Standards Norway). _ Bibliography Mitschke, H. “Effects of Chloride Contamination on Performance of Tank and Vessel Linings.
43、” Society of Protective Coatings (SSPC) Seminar Proceedings, pp. 304314. November 1216, 2000. Pittsburgh, PA: SSPC. Soltz, G.C. “The Effects of Substrate Contaminants on the Life of Epoxy Coatings Submerged in Seawater.” San Diego, CA: National Shipbuilding Research Program (NSRP) Report, Task 3-84-
44、2, March 1991. SP0213-2013 4 NACE International _ Appendix A Standard Method for Performance of Soluble Salts Testing in Accordance with ISO 8502-9 (Mandatory) (Description in accordance with NACE SP0508) This test protocol is based on ISO 8502-6 and 8502-9 methods of conductivity evaluation, and pr
45、ovides a detailed and standardized process to be used for determination of conductivity using a flexible adhesive sample patch (e.g., Bresle patch) and a direct-reading conductivity meter with a sensor that can accurately measure conductivity of small quantities of fluid (i.e., 0.5 mL). This standar
46、d method for performance (ISO 8502-9) has been tested in the field, and is suitable for use when a standardized method is required (e.g., in specifications). The method is similar to that widely used in the industry. A1 Bresle Patch Background Contamination Bresle patches from different manufacturer
47、s or different manufacturing lots have different levels of background ionic contamination. The average background Bresle patch contamination for each manufacturing lot of Bresle patches used for the equivalence demonstration in this standard shall be determined as follows: A1.1 Use a clean, flat, plate-glass panel with enough area for 10 Bresle patch measurements. A1.2 Rinse the glass panel a minimum of three times with deion
