ДСТУ EN 12473:2022 Загальні принципи катодного захисту в морській воді (EN 12473:2014, IDT)



ДСТУ EN 12473:2022
(EN 12473:2014, IDT)

Загальні принципи катодного захисту в морській воді

 
     
Не є офіційним виданням.
Офіційне видання розповсюджує національний орган стандартизації
(ДП «УкрНДНЦ» http://uas.gov.ua)

Contents

Foreword

1 Scope

2 Normative references

3 Terms, definitions, abbreviations and symbols

4 Application of cathodic protection in seawater

4.1 General

4.2 Galvanic anode method

4.3 Impressed current method

4.4 Hybrid systems

5 Determination of level of cathodic protection

5.1 Measurement of protection level

5.2 Reference electrodes

5.3 Potentials of reference electrodes

5.4 Verification of reference electrodes

5.5 Potential measurement

6 Cathodic protection potential criteria

6.1 General

6.2 Carbon-manganese and low alloy steels

6.3 Other metallic materials

6.3.1 General

6.3.2 Stainless steels

6.3.3 Nickel alloys

6.3.4 Aluminium alloys

6.3.5 Copper alloys

7 Design considerations

7.1 Introduction

7.2 Technical and operating data

7.2.1 Design life

7.2.2 Materials of construction

7.3 Surfaces to be protected

7.4 Protective coatings

7.5 Availability of electrical power

7.6 Weight limitations

7.7 Adjacent structures

7.8 Installation considerations

7.9 Current demand

8 Effect of environmental factors on current demand

8.1 Introduction

8.2 Dissolved oxygen

8.3 Sea currents

8.4 Calcareous deposits

8.5 Temperature

8.6 Salinity

8.7 pH

8.8 Marine fouling

8.9 Effect of depth

8.10 Seasonal variations and storms

9 Secondary effects of cathodic protection

9.1 General

9.2 Alkalinity

9.3 Environmentally-assisted cracking

9.3.1 General

9.3.2 Hydrogen embrittlement

9.3.3 Corrosion fatigue

9.4 Chlorine

9.5 Stray currents and interference effects

10 Use of cathodic protection in association with coatings

10.1 Introduction

10.2 Coating selection

10.3 Coating breakdown

Annex A (informative) Corrosion of carbon-manganese and low-alloy steels

A.1 Nature of metallic corrosion

A.2 Polarization

Annex B (informative) Principles of cathodic protection

Annex C (informative) Reference electrodes

C.1 General

C.2 Silver/silver chloride/seawater electrode

C.3 The zinc/seawater electrode

C.4 Verification of reference electrodes

Annex D (informative) Corrosion of metallic materials other than carbon-manganese and low alloy steels typically subject to cathodic protection in seawater

D.1 Stainless steels

D.2 Nickel alloys

D.3 Aluminium alloys

D.4 Copper alloys

Bibliography