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How Can DIN 603 Be More Corrosion Resistant

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Stainless steel is generally "stainless" in the atmosphere. The so-called stainless is a relative concept. Its corrosion resistance is conditional. Under certain conditions, stainless steel will also corrode.  At present, there is no stainless steel with non-rust and corrosion resistance in any corrosive environment.  Local corrosion is the most serious corrosion form of stainless steel DIN 603.  This includes stress corrosion cracking, pitting, intergranular corrosion, crevice corrosion and fatigue corrosion.
1. Impact of Environmental Media
Certain types of corrosion usually occur under some specific environmental conditions, pitting is easy to occur in media with special ions;  Crevice corrosion may occur in the crevices where the solution stagnates or in the blocked surface, the joint of metal or metal and nonmetal, and the contact with rivets, bolts, gaskets, valve seats, loose surface deposits and marine organisms;  The necessary conditions for the occurrence of stress corrosion cracking are tensile stress (whether residual stress, external stress, or both) and the presence of specific corrosion medium, etc.

The environment affects the corrosion resistance of stainless steel round head bolts. Taking pitting corrosion as an example, the composition, concentration, pressure, temperature and PH value of environmental medium all affect the corrosion resistance of stainless steel round head bolts.  Stainless steel is prone to pitting corrosion in media containing halogen anion CI-, Br-, I-.  It is generally believed that pitting corrosion can only occur when halogen elements reach a certain concentration. The pitting potential of stainless steel round head bolts is related to the concentration of halogen elements, etc. Anions such as OH-, SO42- and the like in the medium can inhibit pitting corrosion of stainless steel round head bolts, and the effect decreases as follows:  OH-NO3-AC-SO42-CIO4-。  At the same time, temperature, PH value and flow rate in the medium all affect pitting corrosion of stainless steel Round Head Bolt.  As the temperature rises, the pitting potential of stainless steel round head bolts decreases and pitting is more likely to occur.  When pH > 10, the pitting potential increases, but when pH is less than 10, the effect is very small. Generally, the flow rate of medium increases and the pitting tendency decreases.  For stainless steel round head bolts, the flow rate favorable for reducing pitting is about 1m/s. If the flow rate is too large, erosion corrosion will occur.

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