introduction
ISO (International Organization for Standardization) is a global alliance of national standards bodies (ISO member bodies). The development of international standards is usually carried out through ISO technical committees. Each member institution interested in a subject on which a technical committee has been established has the right to be represented on that committee. International governmental and non-governmental organizations liaising with ISO are also involved in this work. ISO works closely with the International Electrotechnical Commission (IEC) on all matters of electrical standardization.

The procedures used to develop this document and those used for further maintenance are described in Part 1 of the ISO/IEC Directive. In particular, attention should be paid to the different approval criteria required for different types of ISO documents. This document has been drafted in accordance with the editing rules of ISO/IEC Directive Part 2 (see iso.org/directives).

Please note that certain elements of this document may be subject to patent rights. ISO is not responsible for identifying any or all such patents. Details of any patent rights identified during the preparation of the document will be found in the introduction and/or in the list of patent claims received by ISO (see iso.org/patents).

ISO 8504-3-2018 “Preparation of steel substrates before use of paints and related products – Surface treatment methods – Part 3: Cleaning by hand and power tools”

Any trade names used in this document are provided for the convenience of the user and do not constitute an endorsement.

Voluntary, related standards and conformity assessment related ISO specific terminology and express the meaning of and the ISO in the technical barriers to trade (TBT) adhere to the principle of the world trade organization (WTO) information, please see the iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 35, Paints and Varnishes, Subcommittee SC 12, Preparing steel substrates prior to the application of paints and related products.

The second edition cancels and replaces the first edition (ISO 8504-3:1993), which has been technically revised.

The main changes from the previous edition are as follows:

– Added rotary impact tools to power tool types;

– Substitute assessment for inspection in Article 6.

A list of all the parts in the ISO 8504 series can be found on the ISO website.

Any feedback or questions regarding this document should be directed to the user’s national standards body. A complete list of these institutions can be found at www.iso.org/members.html.

ISO 8504-3-2018 “Preparation of steel substrates before use of paints and related products – Surface treatment methods – Part 3: Cleaning by hand and power tools”

introduce
The protective coating properties of paint and related products applied to steel are significantly affected by the surface state of the steel before coating. The main factors known to affect this performance include:

a) There is corrosion and mill scale;

b) the presence of surface contaminants, including salt, dust, oil and grease;

c) Surface profile.

ISO 8501 and ISO 8502 are ready to provide methods for assessing these factors, while ISO 8504 provides guidance on preparation methods that can be used to clean steel substrates, indicating the ability of each method to achieve a specified level of cleanliness.

These international standards do not contain recommendations for protective coating systems applied to steel surfaces. They also do not contain recommendations for surface quality requirements for specific situations, even though surface quality can directly affect the choice of protective coating to be applied and its performance. These recommendations are found in other documents such as national standards and codes of practice. Users of these international standards should ensure that the specified quality is:

– Compatible with and applicable to the environmental conditions to which the steel will be exposed and the protective coating system to be used;

– Within the capacity of the specified cleaning procedure.

ISO 8504-3-2018 “Preparation of steel substrates before use of paints and related products – Surface treatment methods – Part 3: Cleaning by hand and power tools”

The above three international standards cover the following aspects of steel substrate preparation:

ISO 8501 (all parts) : Visual assessment of surface cleanliness;

ISO 8502 (all parts) : Surface cleanliness assessment test;

ISO 8504 (all parts) : Surface treatment methods.

Each of these international standards is divided into separate sections.

The main objective of surface treatment is to ensure the removal of harmful substances and to obtain a surface that allows a satisfactory adhesion of the primer to the steel. It also helps to reduce the amount of contaminants that cause corrosion.

This document describes how to clean manual and power tools. It should be read in conjunction with ISO 8504-1.

Manual and power tool cleaning are surface treatment methods that typically provide a lower surface cleanliness than that achieved by sandblasting. When results similar to sandblasting cleaning are required, these methods in most cases require the use of multiple types of power tools, which makes surface treatment complicated and expensive. It is often impossible to remove oils, greases and corrosion irritants such as chlorides and sulfates.

Power tool cleaning generally provides a better base for the primer than hand tool cleaning, resulting in better paint performance.

Both manual and power tool cleaning are suitable surface treatments. Hand tool cleaning in particular requires the use of primers with good surface wetting ability. Power tool cleaning is appropriate when a higher quality grade of surface treatment is required, sandblasting cleaning is not allowed or the interested parties consider it not feasible.

Representative photographic examples of St 2, St 3, PSt 2, PSt 3 and PMa (see ISO 8501-1 and ISO 8501-2) for evaluating some new and previously coated steel surfaces cleaned using hand or power tools. Since many different situations arise during surface preparation and these photographs are not always sufficient to describe specific examples, it is recommended that special photographs of the treated reference area acceptable to all parties concerned be made as the basis for further surface preparation procedures.

ISO 8504-3-2018 “Preparation of steel substrates before use of paints and related products – Surface treatment methods – Part 3: Cleaning by hand and power tools”

1 Range
This document describes how to clean the steel substrate with hand tools and power tools before applying paint and related products. It is suitable for both new steel structures and previously coated steel surfaces that show areas of decomposition where paint needs to be maintained. It describes the equipment to be used and the procedures to be followed.

2 Normative references

The following files are referenced in text in a manner that constitutes part or all of the requirements of this document. For dated references, only the cited version applies. For undated references, a new version of the reference (including any revisions) applies.

ISO 8501-1, Preparation of steel substrates prior to painting and related products – Visual assessment of surface cleanliness – Part 1: Rust grades and preparation grades of uncoated steel substrates and steel substrates after the overall removal of prior coatings

ISO 8501-2, Preparation of steel substrates prior to painting and related products – Visual assessment of surface cleanliness – Part 2: Preparation grade of previously coated steel substrates after local removal of previous coatings

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO 8504-3-2018 “Preparation of steel substrates before use of paints and related products – Surface treatment methods – Part 3: Cleaning by hand and power tools”

3.1 Cleaning Hand Tools

A method of preparing steel substrates using hand tools without power assistance

Note 1: Chipping hammer, hand scraper, hand line brush, sandpaper and plastic wool embedded with abrasive are usually used. Sometimes hand tool cleaning is done initially to remove relatively loose contaminants before using power tools.

3.2 Clean power tools

A method for preparing a steel substrate using a power-assisted hand tool, but excluding shot blasting cleaning

Note 1: Rotary scaler, rotary wire brush, rotary impact tool, sander, sander, rotary abrasive coated paper wheel (turning wheel), abrasive grinder, plastic wool with embedded abrasive, chipping hammer and needle gun, driven by electric or pneumatic, or connected to remote control or robotic equipment, are examples of equipment commonly used.

3.3 Water, solvent or chemical cleaning

Method for removing visible oil, grease, dirt or process lubricants and other soluble contaminants from steel surfaces

Note 1: For more details and cleaning methods, see ISO 12944-4:2017, 6.2.

ISO 8504-3-2018 “Preparation of steel substrates before use of paints and related products – Surface treatment methods – Part 3: Cleaning by hand and power tools”

3.4 Contaminated surface

A surface with substances that are harmful to the performance of the protective coating system

Note 1: Typical contaminants include slag, rust, laminate rust, mill scale, oil, grease, flux and weld spatter, soluble iron corrosion products, and other soluble salts, including chlorides and sulfates.

3.5 Cleaning Surfaces

A surface where contaminants have been removed to a specified or agreed surface cleanliness level

Note 1: Complete details are provided in ISO 8501-1 and ISO 8501-2.

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