NACE WJ-2-2021 (SSPC-SP WJ-2)

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NACE WJ-2/SSPC-SP WJ-2-2021

Reafrmed November 3, 2021

reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording,

or otherwise) without the prior written permission of AMPP.

Joint Surface Preparation Standard,

“Waterjet Cleaning of Metals—

Very Thorough Cleaning (WJ-2)” (SP0312)

This AMPP 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 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 AMPP standard is to be construed as granting any right, by implication or other-

wise, to manufacture, 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 of better procedures or materials. Neither

is this standard intended to apply in all cases relating to the subject. Unpredictable circumstances may negate the use-

fulness of this standard in specic instances. AMPP assumes no responsibility for the interpretation or use of this stan-

dard by other parties and accepts responsibility for only those ofcial AMPP interpretations issued by AMPP in accor-

dance with its governing procedures and policies which preclude the issuance of interpretations by individual volunteers.

Users of this AMPP standard 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 AMPP standard may

not necessarily address all potential health and safety problems or environmental hazards associated with the use of

materials, equipment, and/or operations detailed or referred to within this standard. Users of this AMPP standard are

also responsible for establishing appropriate health, safety, and environmental protection practices, in consultation with

appropriate regulatory authorities, if necessary, to achieve compliance with any existing applicable regulatory require-

ments prior to the use of this standard.

CAUTIONARY NOTICE: AMPP standards are subject to periodic review and may be revised or withdrawn at any time

in accordance with AMPP technical committee procedures. AMPP requires that action be taken to reafrm, revise, or

withdraw this standard no later than ve years from the date of initial publication and subsequently from the date of each

reafrmation or revision. The user is cautioned to obtain the latest edition. Purchasers of AMPP standards may receive

current information on all standards and other AMPP/NACE/SSPC publications by contacting AMPP Customer Support,

15835 Park Ten Place, Houston, Texas 77084-5145 (Tel: +1 281-228-6200, email: customersupport@ampp.org).

AMPP values your input. To provide feedback on this standard, please contact: standards@ampp.org

NACE WJ-2/SSPC-SP WJ-2-2021

Document History

2021-11-03: Reafrmed by AMPP Standards Committee (SC) 05, “Surface Preparation.”

2017-01-05: Editorial Corrections by TG 276, NACE WJ-2/SSPC-SP WJ-2 Waterjet Cleaning of Metals—Very Thorough

Cleaning (WJ-2) (SP0312), and by SSPC Group Committee C.2 on Surface Preparation.

2012-03-10: Developed by TG 276, NACE WJ-2/SSPC-SP WJ-2 Waterjet Cleaning of Metals—Very Thorough Cleaning

(WJ-2) (SP0312), and by SSPC Group Committee C.2 on Surface Preparation.

NOTE: This standard is one of a set of four standards on degrees of surface cleanliness to be achieved by waterjet

cleaning that are intended to replace NACE No. 5/SSPC-SP 12,1 which includes all four degrees of surface cleanliness.

Joint Surface Preparation Standard,

“Waterjet Cleaning of Metals—

Very Thorough Cleaning (WJ-2)” (SP0312)

NACE WJ-2/SSPC-SP WJ-2-2021

Foreword ..................................................................................................................................................................5

Section 1 General .....................................................................................................................................................6

Section 2 Denitions .................................................................................................................................................6

Section 3 Additional Technical Considerations .........................................................................................................7

3.1 Flash Rust……… ........................................................................................................................7

3.2 Appearance Variations ................................................................................................................7

Section 4 Associated Documents .............................................................................................................................8

Section 5 Procedures Before Waterjet Cleaning ....................................................................................................... 8

Section 6 Waterjet Cleaning Methods .......................................................................................................................8

Section 7 Procedures Following Waterjet Cleaning and Immediately Prior to Coating ............................................. 9

References ..................................................................................................................................................................9

Appendix A Explanatory Notes (Nonmandatory) ........................................................................................................11

A1 Function ....................................................................................................................................11

A2 Maintenance Coating Work ....................................................................................................... 11

A3 Surface Prole ...........................................................................................................................11

A4 Rust Scale .................................................................................................................................11

A5 Mill Scale ...................................................................................................................................11

A6 Reference Photographs ............................................................................................................12

A7 Quality of Water ........................................................................................................................12

A8 Nonvisible Contamination (NV) .................................................................................................12

A9 Use of Corrosion Inhibitors........................................................................................................12

A10 Specication Statement ............................................................................................................13

A11 Flash Rust .................................................................................................................................13

A12 Surface Imperfections ...............................................................................................................13

A13 Removal of Coatings with Hazardous Components—Hygiene ................................................. 13

A14 Film Thickness ..........................................................................................................................13

Appendix B Methods of Assessing the Degree of Flash Rust (Nonmandatory) .........................................................14

B1 Wipe Test ..................................................................................................................................14

B2 Tape Pull Test ............................................................................................................................14

Appendix C Waterjet Cleaning Equipment and Operating Parameters (Nonmandatory) ...........................................15

C1 Waterjet Cleaning Equipment ...................................................................................................15

C2 Operating Parameters ...............................................................................................................15

Joint Surface Preparation Standard,

“Waterjet Cleaning of Metals—

Very Thorough Cleaning (WJ-2)” (SP0312)

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摘要：

NACE WJ-2-2021 (SSPC-SP WJ-2) 是由美国腐蚀工程师协会与防护涂料协会联合发布的水射流表面处理标准，专为工业涂装前的高压水清洗作业提供技术规范。该标准主要针对金属表面上的松散锈层、旧涂层、盐分及其他污染物的去除，要求最终处理后的表面在无可见水溶性盐或油污的前提下，仍保留部分附着的原有涂层或氧化层，达到“闪锈抑制”且无明显残留水膜的效果。相较于更高清洁度的WJ-1标准，WJ-2允许表面存在轻微颜色变化但无油、无盐、无松散物质，适用于中等耐久性涂层的底材准备。此规范同时涵盖

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