GB/T 34626.2-2017Metallic and other inorganic coatings -- Cleaning and preparation of metal surfaces -- Part 2: Non-ferrous metal and alloys (English PDF)

Foreword

GB/T 34626 "metal and other inorganic coating surface cleaning and preparation" is divided into two parts.

--- Part 1. Steel and its alloys;

--- Part 2. Non-ferrous metals and their alloys.

This section GB/T 34626 Part 2.

This section drafted in accordance with GB/T 1.1-2009 given rules.

This section uses redrafted law revision using ISO 27831-2:2008 "Metal and other inorganic surface coating metal cleaning and Prepare part 2. Non-ferrous metals and their alloys. " this section compared with ISO 27831-2:2008, the main differences and the reasons are as follows.

--- On normative references, this standard made a technical difference with the adjustment to adapt to China's technical conditions, adjust the situation Concentration reflected in the second chapter "Normative references", the specific adjustments are as follows.

Replace ISO 2080 with GB/T 3138 equivalent to international standards (see Chapter 3);

Replace ISO 2064 with GB/T 12334 equivalent to international standards (see Chapter 3);

Use GB/T 13913 equivalent to international standards instead of ISO 4527 (see 11.8);

Use equivalent to international standards GB/T 19349 instead of ISO 9587 (see 7.1.2);

Use GB/T 19350 equivalent to the international standard instead of ISO 9588 (see 20.1);

Replace ISO 10074 with GB/T 19822 equivalent to international standards (see 11.4);

Use equivalent to international standards GB/T 31566 instead of ISO (see 11.12);

GB/T 34626-1.2017 modified to adopt international standards instead of ISO 27831-1:2008.

This part is proposed by China Machinery Industry Federation.

This part of the National Metal and Nonmetallic Coating Standardization Technical Committee (SAC/TC57) centralized.

This part of the drafting unit. Wuhan Institute of Materials Protection, COSCO rare earth New Materials Co., Ltd., Zhaoqing College, Guangzhou City, VW five Gold Co., Ltd., Shandong Taifeng Cleaning Technology Co., Ltd., Dongying Yellow River Delta Standard Technical Service Center, Shenzhen Green constant low-carbon development Promotion Center.

Introduction

The adhesion of the coating depends on the effect of degreasing and cleaning of the substrate surface. For plating (coating), it is necessary to remove the manufacturing process the resulting grease, oil, dirt, or other forms of contaminants formed as a result of corrosion/erosion during storage and use to obtain a non-corrosive, clean, Chemically active surface.

Surface contaminants may be.

--- Steel and non-ferrous metal castings on the corrosion products, sand or mold release agent;

--- Corrosion products and scale (such as hot rolled steel, steel beams, etc.) (for the substrate, the crushed scale is the cathode);

--- Oil on the cold-rolled steel and rolling lubricant;

--- Rolling aluminum rolling lubricant;

--- Hot-dip galvanized steel, steel/bracket in the transport or storage process of corrosion products;

--- Storage and handling of other pollutants generated in the process.

It is well known that plating/coating the surface of these materials is difficult.

There are many ways to remove surface contaminants, among other factors, depending on the type and level of pollutants the size and shape of the body, the cleanliness requirements, the availability of the necessary facilities, the cost of the treatment and its impact on the environment, Process characteristics.

GB/T 34626 listed cleaning methods, covering the mechanical method (this method to achieve the lowest degree of cleanliness), chemical and ultrasonic methods ( to achieve relatively high cleanliness) and glow discharge plasma treatment (sputter cleaning) of the substrate before vapor deposition.

GB/T 34626 lists the coating (coated) with or without coating the coating layer, the metal and its alloys cleaning practical method.

The cleaning process given in GB/T 34626.1 and GB/T 34626.2 is only the most commonly practiced method in practice. However, many solutions do Square programs and special handling methods are not included in GB/T 34626.1 and GB/T 34626.2. This standard references these as much as possible Special treatment method For reference GB/T 34626 parts given in other treatment processes, refer to the standard parts of the reference Listed publications.

GB/T 34626.1 applies to steel and its alloys, and GB/T 34626.2 applies to non-ferrous metals and alloys. In order to make as much as possible GB/T 34626.2 as a separate standard document to use, GB/T 34626.1 chapters 1 to 6 are contained in GB/T 34626.2 , Also Chapter 1 to Chapter 6, other terms according to the order of GB/T 34626.1 numbering. In addition, some of GB/T 34626.1 for steel Material cleaning and preparation process can also be applied to non-ferrous metal materials, therefore, these cleaning and preparation process also according to GB/T 34626.1 Shun Sort and use the same name.

Metal and other inorganic coatings Cleaning and preparation of metal surfaces Part 2. Non-ferrous metals and their alloys Warning --- GB/T 34626 this part requires the use of some of the substances and processes, if you do not take appropriate measures, health products Health hazards. This section does not discuss any health hazards, safety or environmental issues and regulations involved in the use of the standard. Producer, buy Party and standard users are responsible for establishing appropriate health, safety and environmental regulations and taking appropriate measures to bring them in line with national, local and /International regulations and rules. Compliance with this section does not imply a legal exemption.

1 Scope

GB/T 34626 provisions of this part of the non-ferrous metals and their alloys surface cleaning process.

This section applies to remove any irrelevant or undesirable sediments and other pollutants generated during the production, storage and use, and for the metal surface to prepare for the next step.

This section does not apply to the initial accumulation of oil, grease and dirt and other heavy deposits during the initial cleaning operation, preparation before welding or electrical contact Clean the point. However, the user can determine whether many of the processes in GB/T 34626 can be used for these cleaning.

This section covers the process is plated (coating) the following coating before the required metal surface preparation.

--- Electroplating metal layer;

--- Autocatalytic metallization (autocatalytic and replacement);

--- Conversion film;

--- Anodized film;

--- Hot dip coating;

--- Metal spray coating;

--- Glaze porcelain coating;

--- physical vapor deposition of aluminum and cadmium layer;

--- Powder coating.

This section describes the following process.

--- Degreasing

--- descaling

--- pickling;

--- Etching;

--- Rust

--- Chemical leveling;

--- Chemical polishing;

--- electrolytic brightening

---Electrolytic polishing;

--- Anode fluoride treatment (manganese alloy used when cleaning).

The process described above applies to the following metals.

--- Aluminum and aluminum alloy;