Hjem > Blog > Fælles problem > What is passivation? Does my product need it?

What is passivation? Does my product need it?

kilde:Qianye præcision tid:2022-9-14
 “My new stainless steel product specification requires’ passivation ‘. Do I need it?” Our answer is that you may not. That’s why.
Passivation is the process of protecting stainless steel from corrosion by adding an oxide layer on its outer surface. Although some stainless steel product specifications require passivation to reduce corrosion risk, most of them are unnecessary and expensive, and may damage some metal products, including flat bar springs, such as constant force, variable force and constant torque springs, all of which are uncommon products manufactured by Qianye precision.

    The reason passivation is not a good idea for flat bar springs is because passivation involves the use of acids and harsh chemicals to initially clean the metal as part of the process. The geometry of these spring types means that many small cracks can form between the coil layers. The acid used in passivation can become trapped in these crevices. This resulted in longer-than-expected exposure of the stainless steel, which in turn resulted in hydrogen embrittlement and eventual spring failure. Additionally, mechanically exposing all surfaces of the spring to acid can damage the spring, resulting in changes in force/torque output or defects.

There are better, simpler, cheaper ways to avoid any need for corrosion and passivation of stainless steel components, and it’s as simple as choosing a fussy material. Remember that the risk of corrosion of any stainless steel component is driven by the environment (such as the presence of water and other chemicals) and Qianye Precision typically uses high quality 301 stainless steel for our springs. Our stainless steels typically contain 16% to 18% chromium, an element that forms a protective layer in passivation anyway. These percentages are comparable to various other stainless steel grades specified in the ASTM A666 Specification for Austenitic Stainless Steels. This chromium content provides corrosion protection in most non-extreme environments.

    In summary, specifications sometimes require passivation to prevent corrosion, even after proper material selection; however, the acids and chemicals used in cleaning stainless steel for passivation can severely damage constant force, power, and constant torque springs . Choosing a different alloy (this is where our Qianye Precision Engineers can help!) may invalidate any passivation needs. Not all springs are susceptible to damage from the passivation process (such as open helical compression springs, bar and wire), but there are still some risks and added costs, so we recommend avoiding passivation altogether.
    Shenzhen Qianye Precision Metal Co., Ltd. was established in 2006, supplying high-quality stainless steel springs for many fields. Through continuous efforts, it has obtained 19 patent certificates and 4 spring equipment software copyrights granted by the State Intellectual Property Office, creating an enviable industry influence. The company designs and manufactures a wide range of power springs, constant force springs, constant torsion springs, variable force springs and motor brush springs. Chiba works closely with customers to develop custom solutions to meet their individual needs. In order to provide better service, it has been continuously investing in production technology and supply chain. The company itself is a stainless steel raw material manufacturer. Due to the support of raw materials, there is no material limitation when making spring products; special material requirements can be developed and manufactured; in addition, the delivery time is greatly shortened. Quality is the top priority. Qianye has passed ISO9001, ISO14001 and national high-tech enterprise certification, and attaches great importance to the training of employees. Its spirit is “treat people with sincerity, create things with sincerity”, and strive for excellence.

Seneste nyt

 Customized Springs: Tailored Solutions for Your Specific Needs
Customized Springs: Tailored Solutions for Your Specific Needs

Time:2023-6-16

Springs are an essential component of many mechanical systems, ranging from simple devices to complex machinery. They are used in a wide range of applications, including automotive, aerospace, medical, and industrial equipment. Springs come in many shapes, sizes, and materials, and they are designed to perform various functions, such as storing and releasing energy, absorbing shock, and maintaining pressure. While...

 Do you know how clockwork toys work?
Do you know how clockwork toys work?

Time:2023-6-13

Clockwork toys use constant torsion springs made of stainless steel coils. An external force rewinds the spring to the output wheel (energy storage) from its natural state. When the force is removed, the spring returns to its natural state. At the same time, a constant torque (stored elasticity) is generated (released) at the output wheel, hence the term constant torque...

 Spiral Torsion Spring: An Application Overview
Spiral Torsion Spring: An Application Overview

Time:2023-8-30

Introduction: Spiral torsion springs are a type of mechanical spring used in a wide range of applications due to their unique design and functionality. These springs are known for their ability to store and release rotational energy, making them ideal for various industries such as automotive, aerospace, medical, and manufacturing. This article provides an overview of spiral torsion springs, including...

 Exploring the Benefits and Applications of Constant Force Springs
Exploring the Benefits and Applications of Constant Force Springs

Time:2023-6-7

Constant force springs are a unique type of spring that has a constant amount of force applied over a range of motion. They are designed to provide a consistent and reliable force, making them ideal for use in a wide range of applications. In this article, we will explore the benefits and applications of constant force springs. Benefits of Constant...

 Spiral Torsion Spring Design: Essential Factors to Consider
Spiral Torsion Spring Design: Essential Factors to Consider

Time:2023-5-31

Spiral torsion springs are essential components in various mechanical systems. They are used to store and release energy as well as to absorb shock and vibration. The design of spiral torsion springs is critical to the performance of the overall system. In this article, we will discuss the essential factors to consider when designing spiral torsion springs. 1. Load Requirements...

 Customized Springs: Tailoring Solutions for Your Unique Needs
Customized Springs: Tailoring Solutions for Your Unique Needs

Time:2023-6-29

Springs are an essential component in various industries, from automotive to aerospace, and even in everyday objects like pens and mattresses. They play a crucial role in providing stability, support, and flexibility in countless applications. However, not all springs are created equal, and sometimes off-the-shelf options may not meet specific requirements. That's where customized springs come in, offering tailor-made solutions...

Product