The metal materials used in connectors are generally alloys, and few single metal materials are used. As the name implies, alloys are composed of a variety of metals, indicating that they have a variety of chemical elements, such as:
Phosphorus bronze: It is composed of copper, copper, tin, Sn, phosphorus P, iron, iron, lead, lead, zinc and zinc, and its main component is copper.
Brass: It is composed of copper, copper, iron, PHD 2.0 connector terminals, lead, lead, zinc and zinc, etc. The main component is copper.
Stainless steel: by iron, chromium, chromium, PHD 2.0 connector manufacturer, nickel, nickel, carbon, silicon, silicon, manganese, phosphorus, sulfur, aluminum, cobalt and cobalt, the main component is iron.
Standards are uniform provisions for duplicates and overviews. Salt spray test standard is to specify the conditions of salt spray test, such as temperature, humidity, concentration of sodium chloride solution and PH value, connector, and technical requirements for the performance of salt spray test box. The salt spray test standard for the same product should be selected according to the characteristics of salt spray test, corrosion rate of metals and sensitivity to salt spray. Following are some salt spray test standards, such as GB/T 2423.17-1993 "Basic Environmental Test Rules for Electrical and Electronic Products, Test Ka: Salt Spray Test Method", GB/T 2423.18-2000 "Environmental Test for Electrical and Electronic Products, Part 2: Test Kb: Salt Spray, Alternating (Sodium Chloride Solution)", GB5938-86 "Metal for Light Industrial Products". Test Method for Corrosion Resistance of Coatings and Chemical Treatment Layers, GB/T 1771-91, Determination of Neutral Salt Spray Resistance of Paints and Varnishes.
The purpose of salt spray test is to evaluate the salt spray corrosion resistance of products or metal materials. The judgment of salt spray test results is the judgment of product quality. Whether the judgment results are correct and reasonable is the key to measure the salt spray corrosion resistance of products or metals correctly. The judgment methods of salt spray test results are: rating judgment method, weighing judgment method, corrosion occurrence judgment method, corrosion data statistical analysis method. Rating judgment method divides the percentage of corrosion area to total area into several grades according to a certain method, and takes a certain grade as the basis of qualified judgment. It is suitable for evaluating flat plate samples.
The weighing method is to weigh the weight of the samples before and after the corrosion test and calculate the weight of the corrosion loss to evaluate the corrosion resistance quality of the samples. It is especially suitable for evaluating the corrosion resistance quality of a certain metal.
Corrosion detection method is a qualitative method. It judges whether the product is corroded or not after salt spray corrosion test. This method is mostly used in general product standards.
Statistical analysis of corrosion data provides a method for designing corrosion tests, analyzing corrosion data and determining the confidence of corrosion data. It is mainly used for analysis and statistics of corrosion, rather than for quality determination of a specific product.
There are three kinds of salt spray tests: neutral salt spray test (N SS), acetate spray test (AASS) and copper accelerated acetate spray test (CASS), also known as copper chloride acetate spray), among which neutral salt spray test is the most widely used. The basic content of salt spray test is to spray at 35 degrees Celsius, 5% of sodium chloride solution in the test chamber and simulate the accelerated corrosion method of seawater environment. The tolerance time determines the corrosion resistance. The volume of the salt spray box is not less than 012 m³, it should be not less than 014 m³, the temperature inside the box is 5℃± 2℃, the spray pressure is 70 ~ 170kPa, the spray mist collector is at least two, the collection area is 80 cm 2., the test surface is 15~30 degrees in the vertical direction, so that the salt mist can freely settle on the tested surface, not directly spray, the test bracket is made of glass and plastic. The samples can not contact with each other and drop each other; the temperature in the box is 35℃±2℃, and each collector collects solution (1-2) mL ö h.